665151555025 has 24 divisors (see below), whose sum is σ = 856150560000. Its totient is φ = 512079086400.

The previous prime is 665151554999. The next prime is 665151555041. The reversal of 665151555025 is 520555151566.

It is not a de Polignac number, because 665151555025 - 2⁹ = 665151554513 is a prime.

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, 2258650 + ... + 2536099.

It is an arithmetic number, because the mean of its divisors is an integer number (35672940000).

Almost surely, 2^665151555025 is an apocalyptic number.

It is an amenable number.

665151555025 is a deficient number, since it is larger than the sum of its proper divisors (190999004975).

665151555025 is a wasteful number, since it uses less digits than its factorization.

665151555025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794969 (or 4794964 counting only the distinct ones).

The product of its (nonzero) digits is 1125000, while the sum is 46.

The spelling of 665151555025 in words is "six hundred sixty-five billion, one hundred fifty-one million, five hundred fifty-five thousand, twenty-five".