666505115026 has 16 divisors (see below), whose sum is σ = 1045977998400. Its totient is φ = 317922243408.

The previous prime is 666505114993. The next prime is 666505115027. The reversal of 666505115026 is 620511505666.

It is not an unprimeable number, because it can be changed into a prime (666505115027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19097661 + ... + 19132528.

It is an arithmetic number, because the mean of its divisors is an integer number (65373624900).

Almost surely, 2^666505115026 is an apocalyptic number.

666505115026 is a deficient number, since it is larger than the sum of its proper divisors (379472883374).

666505115026 is a wasteful number, since it uses less digits than its factorization.

666505115026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38230593.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 666505115026 in words is "six hundred sixty-six billion, five hundred five million, one hundred fifteen thousand, twenty-six".