161251036556 has 12 divisors (see below), whose sum is σ = 283262278992. Its totient is φ = 80318956848.

The previous prime is 161251036549. The next prime is 161251036561. The reversal of 161251036556 is 655630152161.

161251036556 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 2×161251036556² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76639175 + ... + 76641278.

It is an arithmetic number, because the mean of its divisors is an integer number (23605189916).

Almost surely, 2^161251036556 is an apocalyptic number.

It is an amenable number.

161251036556 is a deficient number, since it is larger than the sum of its proper divisors (122011242436).

161251036556 is a wasteful number, since it uses less digits than its factorization.

161251036556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153280720 (or 153280718 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 161251036556 in words is "one hundred sixty-one billion, two hundred fifty-one million, thirty-six thousand, five hundred fifty-six".