161566012227250 has 32 divisors (see below), whose sum is σ = 318370078840320. Its totient is φ = 61225015158000.

The previous prime is 161566012227241. The next prime is 161566012227251. The reversal of 161566012227250 is 52722210665161.

It is a happy number.

It is a super-2 number, since 2×161566012227250² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161566012227250.

It is not an unprimeable number, because it can be changed into a prime (161566012227251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17006943906 + ... + 17006953405.

It is an arithmetic number, because the mean of its divisors is an integer number (9949064963760).

Almost surely, 2^{161566012227250} is an apocalyptic number.

161566012227250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161566012227250 is a deficient number, since it is larger than the sum of its proper divisors (156804066613070).

161566012227250 is a wasteful number, since it uses less digits than its factorization.

161566012227250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34013897347 (or 34013897337 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 161566012227250 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, twelve million, two hundred twenty-seven thousand, two hundred fifty".