61505155521560 has 64 divisors (see below), whose sum is σ = 138639850110720. Its totient is φ = 24557056634880.

The previous prime is 61505155521529. The next prime is 61505155521581. The reversal of 61505155521560 is 6512555150516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118971152 + ... + 119487008.

It is an arithmetic number, because the mean of its divisors is an integer number (2166247657980).

Almost surely, 2^{61505155521560} is an apocalyptic number.

It is an amenable number.

61505155521560 is an abundant number, since it is smaller than the sum of its proper divisors (77134694589160).

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

61505155521560 is a wasteful number, since it uses less digits than its factorization.

61505155521560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521316 (or 521312 counting only the distinct ones).

The product of its (nonzero) digits is 1125000, while the sum is 47.

The spelling of 61505155521560 in words is "sixty-one trillion, five hundred five billion, one hundred fifty-five million, five hundred twenty-one thousand, five hundred sixty".