166917598651 has 2 divisors, whose sum is σ = 166917598652. Its totient is φ = 166917598650.

The previous prime is 166917598633. The next prime is 166917598699. The reversal of 166917598651 is 156895719661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166917598651 - 2²¹ = 166915501499 is a prime.

It is a super-2 number, since 2×166917598651² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166917598151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83458799325 + 83458799326.

It is an arithmetic number, because the mean of its divisors is an integer number (83458799326).

Almost surely, 2^166917598651 is an apocalyptic number.

166917598651 is a deficient number, since it is larger than the sum of its proper divisors (1).

166917598651 is an equidigital number, since it uses as much as digits as its factorization.

166917598651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24494400, while the sum is 64.

The spelling of 166917598651 in words is "one hundred sixty-six billion, nine hundred seventeen million, five hundred ninety-eight thousand, six hundred fifty-one".