667445073731 has 2 divisors, whose sum is σ = 667445073732. Its totient is φ = 667445073730.

The previous prime is 667445073683. The next prime is 667445073811. The reversal of 667445073731 is 137370544766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667445073731 is a prime.

It is a super-2 number, since 2×667445073731² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (667445079731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333722536865 + 333722536866.

It is an arithmetic number, because the mean of its divisors is an integer number (333722536866).

Almost surely, 2^667445073731 is an apocalyptic number.

667445073731 is a deficient number, since it is larger than the sum of its proper divisors (1).

667445073731 is an equidigital number, since it uses as much as digits as its factorization.

667445073731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8890560, while the sum is 53.

The spelling of 667445073731 in words is "six hundred sixty-seven billion, four hundred forty-five million, seventy-three thousand, seven hundred thirty-one".