61505155521556 has 12 divisors (see below), whose sum is σ = 107634093290080. Its totient is φ = 30752557438680.

The previous prime is 61505155521529. The next prime is 61505155521581. The reversal of 61505155521556 is 65512555150516.

It is a super-2 number, since 2×61505155521556² (a number of 28 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3245065 + ... + 11555983.

Almost surely, 2^{61505155521556} is an apocalyptic number.

It is an amenable number.

61505155521556 is a deficient number, since it is larger than the sum of its proper divisors (46128937768524).

61505155521556 is a wasteful number, since it uses less digits than its factorization.

61505155521556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161054 (or 10161052 counting only the distinct ones).

The product of its (nonzero) digits is 5625000, while the sum is 52.

The spelling of 61505155521556 in words is "sixty-one trillion, five hundred five billion, one hundred fifty-five million, five hundred twenty-one thousand, five hundred fifty-six".