166031644046225 has 24 divisors (see below), whose sum is σ = 209442205661592. Its totient is φ = 130539577190400.

The previous prime is 166031644046173. The next prime is 166031644046237. The reversal of 166031644046225 is 522640446130661.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 56741011871569 + 109290632174656 = 7532663^2 + 10454216^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166031644046225 is a prime.

It is a super-2 number, since 2×166031644046225² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161366612 + ... + 162392261.

It is an arithmetic number, because the mean of its divisors is an integer number (8726758569233).

Almost surely, 2^{166031644046225} is an apocalyptic number.

It is an amenable number.

166031644046225 is a deficient number, since it is larger than the sum of its proper divisors (43410561615367).

166031644046225 is a wasteful number, since it uses less digits than its factorization.

166031644046225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323759237 (or 323759232 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 50.

The spelling of 166031644046225 in words is "one hundred sixty-six trillion, thirty-one billion, six hundred forty-four million, forty-six thousand, two hundred twenty-five".