667740336420651 has 32 divisors (see below), whose sum is σ = 979353005541120. Its totient is φ = 402172906533504.

The previous prime is 667740336420617. The next prime is 667740336420653. The reversal of 667740336420651 is 156024633047766.

It is not a de Polignac number, because 667740336420651 - 2¹⁰ = 667740336419627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667740336420653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 638675280 + ... + 639719933.

It is an arithmetic number, because the mean of its divisors is an integer number (30604781423160).

Almost surely, 2^{667740336420651} is an apocalyptic number.

667740336420651 is a deficient number, since it is larger than the sum of its proper divisors (311612669120469).

667740336420651 is a wasteful number, since it uses less digits than its factorization.

667740336420651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278395515.

The product of its (nonzero) digits is 91445760, while the sum is 60.

The spelling of 667740336420651 in words is "six hundred sixty-seven trillion, seven hundred forty billion, three hundred thirty-six million, four hundred twenty thousand, six hundred fifty-one".