61559671536 has 180 divisors, whose sum is σ = 195477696960. Its totient is φ = 18052531200.

The previous prime is 61559671519. The next prime is 61559671541. The reversal of 61559671536 is 63517695516.

61559671536 is a `hidden beast` number, since 6 + 1 + 5 + 596 + 7 + 15 + 36 = 666.

61559671536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 483160 + ... + 597128.

Almost surely, 2^61559671536 is an apocalyptic number.

61559671536 is a gapful number since it is divisible by the number (66) 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 61559671536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97738848480).

61559671536 is an abundant number, since it is smaller than the sum of its proper divisors (133918025424).

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

61559671536 is a wasteful number, since it uses less digits than its factorization.

61559671536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114036 (or 114016 counting only the distinct ones).

The product of its digits is 5103000, while the sum is 54.

The spelling of 61559671536 in words is "sixty-one billion, five hundred fifty-nine million, six hundred seventy-one thousand, five hundred thirty-six".