666051501566 has 32 divisors (see below), whose sum is σ = 1095096741120. Its totient is φ = 301311014400.

The previous prime is 666051501491. The next prime is 666051501587. The reversal of 666051501566 is 665105150666.

It is a self number, because there is not a number n which added to its sum of digits gives 666051501566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4122455 + ... + 4280973.

It is an arithmetic number, because the mean of its divisors is an integer number (34221773160).

Almost surely, 2^666051501566 is an apocalyptic number.

666051501566 is a deficient number, since it is larger than the sum of its proper divisors (429045239554).

666051501566 is a wasteful number, since it uses less digits than its factorization.

666051501566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159440.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 666051501566 in words is "six hundred sixty-six billion, fifty-one million, five hundred one thousand, five hundred sixty-six".