611561557332 has 144 divisors (see below), whose sum is σ = 1743907576320. Its totient is φ = 179026329600.

The previous prime is 611561557307. The next prime is 611561557333. The reversal of 611561557332 is 233755165116.

611561557332 is a `hidden beast` number, since 6 + 1 + 1 + 5 + 61 + 557 + 3 + 32 = 666.

611561557332 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×611561557332² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611561557333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6941268 + ... + 7028820.

It is an arithmetic number, because the mean of its divisors is an integer number (12110469280).

Almost surely, 2^611561557332 is an apocalyptic number.

611561557332 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611561557332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871953788160).

611561557332 is an abundant number, since it is smaller than the sum of its proper divisors (1132346018988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611561557332 is a wasteful number, since it uses less digits than its factorization.

611561557332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88174 (or 88169 counting only the distinct ones).

The product of its digits is 567000, while the sum is 45.

The spelling of 611561557332 in words is "six hundred eleven billion, five hundred sixty-one million, five hundred fifty-seven thousand, three hundred thirty-two".