61531355652 has 96 divisors (see below), whose sum is σ = 160620413184. Its totient is φ = 18210662400.

The previous prime is 61531355629. The next prime is 61531355701. The reversal of 61531355652 is 25655313516.

61531355652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61531355652² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386368 + ... + 521864.

It is an arithmetic number, because the mean of its divisors is an integer number (1673129304).

Almost surely, 2^61531355652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61531355652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80310206592).

61531355652 is an abundant number, since it is smaller than the sum of its proper divisors (99089057532).

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

61531355652 is a wasteful number, since it uses less digits than its factorization.

61531355652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135629 (or 135627 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The spelling of 61531355652 in words is "sixty-one billion, five hundred thirty-one million, three hundred fifty-five thousand, six hundred fifty-two".