667685508071 has 2 divisors, whose sum is σ = 667685508072. Its totient is φ = 667685508070.

The previous prime is 667685508059. The next prime is 667685508103. The reversal of 667685508071 is 170805586766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667685508071 - 2³⁸ = 392807601127 is a prime.

It is a super-2 number, since 2×667685508071² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667685508071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667685508011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333842754035 + 333842754036.

It is an arithmetic number, because the mean of its divisors is an integer number (333842754036).

Almost surely, 2^667685508071 is an apocalyptic number.

667685508071 is a deficient number, since it is larger than the sum of its proper divisors (1).

667685508071 is an equidigital number, since it uses as much as digits as its factorization.

667685508071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 667685508071 in words is "six hundred sixty-seven billion, six hundred eighty-five million, five hundred eight thousand, seventy-one".