166220015706500 has 72 divisors (see below), whose sum is σ = 422293822822872. Its totient is φ = 56989719662400.

The previous prime is 166220015706463. The next prime is 166220015706541. The reversal of 166220015706500 is 5607510022661.

166220015706500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 780791373376 + 165439224333124 = 883624^2 + 12862318^2 .

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, 3392220719 + ... + 3392269718.

It is an arithmetic number, because the mean of its divisors is an integer number (5865191983651).

Almost surely, 2^{166220015706500} is an apocalyptic number.

166220015706500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166220015706500 is an abundant number, since it is smaller than the sum of its proper divisors (256073807116372).

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

166220015706500 is a wasteful number, since it uses less digits than its factorization.

166220015706500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6784490470 (or 6784490451 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 166220015706500 in words is "one hundred sixty-six trillion, two hundred twenty billion, fifteen million, seven hundred six thousand, five hundred".