166021564202956 has 48 divisors (see below), whose sum is σ = 369063374319360. Its totient is φ = 63463278640320.

The previous prime is 166021564202869. The next prime is 166021564202957. The reversal of 166021564202956 is 659202465120661.

It is a super-2 number, since 2×166021564202956² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166021564202897 and 166021564202906.

It is not an unprimeable number, because it can be changed into a prime (166021564202957) 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, 5085182286 + ... + 5085214933.

It is an arithmetic number, because the mean of its divisors is an integer number (7688820298320).

Almost surely, 2^{166021564202956} is an apocalyptic number.

It is an amenable number.

166021564202956 is an abundant number, since it is smaller than the sum of its proper divisors (203041810116404).

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

166021564202956 is a wasteful number, since it uses less digits than its factorization.

166021564202956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170397294 (or 10170397292 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 55.

The spelling of 166021564202956 in words is "one hundred sixty-six trillion, twenty-one billion, five hundred sixty-four million, two hundred two thousand, nine hundred fifty-six".