68646631 has 2 divisors, whose sum is σ = 68646632. Its totient is φ = 68646630.

The previous prime is 68646623. The next prime is 68646637. The reversal of 68646631 is 13664686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68646631 - 2³ = 68646623 is a prime.

It is a super-2 number, since 2×68646631² = 9424719895300322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68646637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34323315 + 34323316.

It is an arithmetic number, because the mean of its divisors is an integer number (34323316).

Almost surely, 2^68646631 is an apocalyptic number.

68646631 is a deficient number, since it is larger than the sum of its proper divisors (1).

68646631 is an equidigital number, since it uses as much as digits as its factorization.

68646631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 40.

The square root of 68646631 is about 8285.3262458397. The cubic root of 68646631 is about 409.4552173553.

The spelling of 68646631 in words is "sixty-eight million, six hundred forty-six thousand, six hundred thirty-one".