166503900125 has 16 divisors (see below), whose sum is σ = 207821952624. Its totient is φ = 133187040000.

The previous prime is 166503900109. The next prime is 166503900151. The reversal of 166503900125 is 521009305661.

It can be written as a sum of positive squares in 8 ways, for example, as 81410926276 + 85092973849 = 285326^2 + 291707^2 .

It is not a de Polignac number, because 166503900125 - 2⁴ = 166503900109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1019105 + ... + 1171145.

It is an arithmetic number, because the mean of its divisors is an integer number (12988872039).

Almost surely, 2^166503900125 is an apocalyptic number.

It is an amenable number.

166503900125 is a deficient number, since it is larger than the sum of its proper divisors (41318052499).

166503900125 is an equidigital number, since it uses as much as digits as its factorization.

166503900125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160817 (or 160807 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 38.

The spelling of 166503900125 in words is "one hundred sixty-six billion, five hundred three million, nine hundred thousand, one hundred twenty-five".