164666961731 has 2 divisors, whose sum is σ = 164666961732. Its totient is φ = 164666961730.

The previous prime is 164666961721. The next prime is 164666961757. The reversal of 164666961731 is 137169666461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164666961731 is a prime.

It is a super-2 number, since 2×164666961731² (a number of 23 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 (164666961721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82333480865 + 82333480866.

It is an arithmetic number, because the mean of its divisors is an integer number (82333480866).

Almost surely, 2^164666961731 is an apocalyptic number.

164666961731 is a deficient number, since it is larger than the sum of its proper divisors (1).

164666961731 is an equidigital number, since it uses as much as digits as its factorization.

164666961731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The spelling of 164666961731 in words is "one hundred sixty-four billion, six hundred sixty-six million, nine hundred sixty-one thousand, seven hundred thirty-one".