666261662031513 has 80 divisors (see below), whose sum is σ = 1044403658464320. Its totient is φ = 422886679027200.

The previous prime is 666261662031503. The next prime is 666261662031533. The reversal of 666261662031513 is 315130266162666.

It is not a de Polignac number, because 666261662031513 - 2⁹ = 666261662031001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666261662031513.

It is not an unprimeable number, because it can be changed into a prime (666261662031503) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 14433598 + ... + 39253688.

It is an arithmetic number, because the mean of its divisors is an integer number (13055045730804).

Almost surely, 2^{666261662031513} is an apocalyptic number.

It is an amenable number.

666261662031513 is a deficient number, since it is larger than the sum of its proper divisors (378141996432807).

666261662031513 is a wasteful number, since it uses less digits than its factorization.

666261662031513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24820340 (or 24820331 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 666261662031513 in words is "six hundred sixty-six trillion, two hundred sixty-one billion, six hundred sixty-two million, thirty-one thousand, five hundred thirteen".