665369975054 has 4 divisors (see below), whose sum is σ = 998054962584. Its totient is φ = 332684987526.

The previous prime is 665369975033. The next prime is 665369975059. The reversal of 665369975054 is 450579963566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 450579963566 = 2 ⋅225289981783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665369975059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166342493762 + ... + 166342493765.

It is an arithmetic number, because the mean of its divisors is an integer number (249513740646).

Almost surely, 2^665369975054 is an apocalyptic number.

665369975054 is a deficient number, since it is larger than the sum of its proper divisors (332684987530).

665369975054 is a wasteful number, since it uses less digits than its factorization.

665369975054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332684987529.

The product of its (nonzero) digits is 183708000, while the sum is 65.

The spelling of 665369975054 in words is "six hundred sixty-five billion, three hundred sixty-nine million, nine hundred seventy-five thousand, fifty-four".