665142587122 has 8 divisors (see below), whose sum is σ = 1074461102316. Its totient is φ = 306988886352.

The previous prime is 665142587119. The next prime is 665142587143. The reversal of 665142587122 is 221785241566.

It can be written as a sum of positive squares in 2 ways, for example, as 663962595921 + 1179991201 = 814839^2 + 34351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×665142587122² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12791203573 + ... + 12791203624.

Almost surely, 2^665142587122 is an apocalyptic number.

665142587122 is a deficient number, since it is larger than the sum of its proper divisors (409318515194).

665142587122 is a wasteful number, since it uses less digits than its factorization.

665142587122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25582407212.

The product of its digits is 1612800, while the sum is 49.

The spelling of 665142587122 in words is "six hundred sixty-five billion, one hundred forty-two million, five hundred eighty-seven thousand, one hundred twenty-two".