166657781325 has 96 divisors (see below), whose sum is σ = 332071603200. Its totient is φ = 72047301120.

The previous prime is 166657781309. The next prime is 166657781347. The reversal of 166657781325 is 523187756661.

It is not a de Polignac number, because 166657781325 - 2⁴ = 166657781309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5661094 + ... + 5690456.

It is an arithmetic number, because the mean of its divisors is an integer number (3459079200).

Almost surely, 2^166657781325 is an apocalyptic number.

166657781325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166657781325 is a deficient number, since it is larger than the sum of its proper divisors (165413821875).

166657781325 is a wasteful number, since it uses less digits than its factorization.

166657781325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29971 (or 29966 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 57.

The spelling of 166657781325 in words is "one hundred sixty-six billion, six hundred fifty-seven million, seven hundred eighty-one thousand, three hundred twenty-five".