667401437437631 has 32 divisors (see below), whose sum is σ = 727102002816000. Its totient is φ = 608900953909248.

The previous prime is 667401437437583. The next prime is 667401437437643. The reversal of 667401437437631 is 136734734104766.

It is not a de Polignac number, because 667401437437631 - 2¹⁰ = 667401437436607 is a prime.

It is a super-2 number, since 2×667401437437631² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667401437437681) 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, 42566574050 + ... + 42566589728.

It is an arithmetic number, because the mean of its divisors is an integer number (22721937588000).

Almost surely, 2^{667401437437631} is an apocalyptic number.

667401437437631 is a deficient number, since it is larger than the sum of its proper divisors (59700565378369).

667401437437631 is a wasteful number, since it uses less digits than its factorization.

667401437437631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27923.

The product of its (nonzero) digits is 128024064, while the sum is 62.

The spelling of 667401437437631 in words is "six hundred sixty-seven trillion, four hundred one billion, four hundred thirty-seven million, four hundred thirty-seven thousand, six hundred thirty-one".