666631347501 has 16 divisors (see below), whose sum is σ = 1015871151744. Its totient is φ = 380912715264.

The previous prime is 666631347479. The next prime is 666631347521. The reversal of 666631347501 is 105743136666.

It is not a de Polignac number, because 666631347501 - 2¹⁴ = 666631331117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666631347521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386256 + ... + 1217561.

It is an arithmetic number, because the mean of its divisors is an integer number (63491946984).

Almost surely, 2^666631347501 is an apocalyptic number.

It is an amenable number.

666631347501 is a deficient number, since it is larger than the sum of its proper divisors (349239804243).

666631347501 is a wasteful number, since it uses less digits than its factorization.

666631347501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623620.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 666631347501 in words is "six hundred sixty-six billion, six hundred thirty-one million, three hundred forty-seven thousand, five hundred one".