166890635780 has 24 divisors (see below), whose sum is σ = 382331275200. Its totient is φ = 60687503840.

The previous prime is 166890635773. The next prime is 166890635783. The reversal of 166890635780 is 87536098661.

It is a super-2 number, since 2×166890635780² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166890635783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379296680 + ... + 379297119.

It is an arithmetic number, because the mean of its divisors is an integer number (15930469800).

Almost surely, 2^166890635780 is an apocalyptic number.

166890635780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166890635780 is an abundant number, since it is smaller than the sum of its proper divisors (215440639420).

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

166890635780 is a wasteful number, since it uses less digits than its factorization.

166890635780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758593819 (or 758593817 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 166890635780 in words is "one hundred sixty-six billion, eight hundred ninety million, six hundred thirty-five thousand, seven hundred eighty".