666253157477042 has 8 divisors (see below), whose sum is σ = 999379846283436. Its totient is φ = 333126542049232.

The previous prime is 666253157477009. The next prime is 666253157477059. The reversal of 666253157477042 is 240774751352666.

It can be written as a sum of positive squares in 2 ways, for example, as 608119989487921 + 58133167989121 = 24660089^2 + 7624511^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 666253157477042.

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, 22907588 + ... + 43095984.

Almost surely, 2^{666253157477042} is an apocalyptic number.

666253157477042 is a deficient number, since it is larger than the sum of its proper divisors (333126688806394).

666253157477042 is a wasteful number, since it uses less digits than its factorization.

666253157477042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36689292.

The product of its (nonzero) digits is 355622400, while the sum is 65.

The spelling of 666253157477042 in words is "six hundred sixty-six trillion, two hundred fifty-three billion, one hundred fifty-seven million, four hundred seventy-seven thousand, forty-two".