166051720812398 has 64 divisors (see below), whose sum is σ = 256941385113600. Its totient is φ = 80444482460160.

The previous prime is 166051720812391. The next prime is 166051720812403. The reversal of 166051720812398 is 893218027150661.

It is a super-2 number, since 2×166051720812398² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166051720812391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21406689536 + ... + 21406697292.

It is an arithmetic number, because the mean of its divisors is an integer number (4014709142400).

Almost surely, 2^{166051720812398} is an apocalyptic number.

166051720812398 is a deficient number, since it is larger than the sum of its proper divisors (90889664301202).

166051720812398 is a wasteful number, since it uses less digits than its factorization.

166051720812398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13505.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 166051720812398 in words is "one hundred sixty-six trillion, fifty-one billion, seven hundred twenty million, eight hundred twelve thousand, three hundred ninety-eight".