71628366731 has 2 divisors, whose sum is σ = 71628366732. Its totient is φ = 71628366730.

The previous prime is 71628366727. The next prime is 71628366737. The reversal of 71628366731 is 13766382617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71628366731 - 2² = 71628366727 is a prime.

It is a super-2 number, since 2×71628366731² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71628366731.

It is not a weakly prime, because it can be changed into another prime (71628366737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35814183365 + 35814183366.

It is an arithmetic number, because the mean of its divisors is an integer number (35814183366).

Almost surely, 2^71628366731 is an apocalyptic number.

71628366731 is a deficient number, since it is larger than the sum of its proper divisors (1).

71628366731 is an equidigital number, since it uses as much as digits as its factorization.

71628366731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The spelling of 71628366731 in words is "seventy-one billion, six hundred twenty-eight million, three hundred sixty-six thousand, seven hundred thirty-one".