68909151631 has 2 divisors, whose sum is σ = 68909151632. Its totient is φ = 68909151630.

The previous prime is 68909151491. The next prime is 68909151713. The reversal of 68909151631 is 13615190986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68909151631 - 2²³ = 68900763023 is a prime.

It is a super-2 number, since 2×68909151631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68909151331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34454575815 + 34454575816.

It is an arithmetic number, because the mean of its divisors is an integer number (34454575816).

Almost surely, 2^68909151631 is an apocalyptic number.

68909151631 is a deficient number, since it is larger than the sum of its proper divisors (1).

68909151631 is an equidigital number, since it uses as much as digits as its factorization.

68909151631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 49.

The spelling of 68909151631 in words is "sixty-eight billion, nine hundred nine million, one hundred fifty-one thousand, six hundred thirty-one".