166121144625 has 32 divisors (see below), whose sum is σ = 278871899904. Its totient is φ = 87813868800.

The previous prime is 166121144611. The next prime is 166121144653. The reversal of 166121144625 is 526441121661.

It is not a de Polignac number, because 166121144625 - 2⁸ = 166121144369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1917757 + ... + 2002506.

It is an arithmetic number, because the mean of its divisors is an integer number (8714746872).

Almost surely, 2^166121144625 is an apocalyptic number.

166121144625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166121144625 is a deficient number, since it is larger than the sum of its proper divisors (112750755279).

166121144625 is a wasteful number, since it uses less digits than its factorization.

166121144625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920394 (or 3920384 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The spelling of 166121144625 in words is "one hundred sixty-six billion, one hundred twenty-one million, one hundred forty-four thousand, six hundred twenty-five".