669951973751 has 2 divisors, whose sum is σ = 669951973752. Its totient is φ = 669951973750.

The previous prime is 669951973729. The next prime is 669951973807. The reversal of 669951973751 is 157379159966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669951973751 - 2⁶ = 669951973687 is a prime.

It is a super-3 number, since 3×669951973751³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669951972751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334975986875 + 334975986876.

It is an arithmetic number, because the mean of its divisors is an integer number (334975986876).

Almost surely, 2^669951973751 is an apocalyptic number.

669951973751 is a deficient number, since it is larger than the sum of its proper divisors (1).

669951973751 is an equidigital number, since it uses as much as digits as its factorization.

669951973751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96446700, while the sum is 68.

The spelling of 669951973751 in words is "six hundred sixty-nine billion, nine hundred fifty-one million, nine hundred seventy-three thousand, seven hundred fifty-one".