71687970749 has 2 divisors, whose sum is σ = 71687970750. Its totient is φ = 71687970748.

The previous prime is 71687970733. The next prime is 71687970791. The reversal of 71687970749 is 94707978617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38132325625 + 33555645124 = 195275^2 + 183182^2 .

It is a cyclic number.

It is not a de Polignac number, because 71687970749 - 2⁴ = 71687970733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71687970719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35843985374 + 35843985375.

It is an arithmetic number, because the mean of its divisors is an integer number (35843985375).

Almost surely, 2^71687970749 is an apocalyptic number.

It is an amenable number.

71687970749 is a deficient number, since it is larger than the sum of its proper divisors (1).

71687970749 is an equidigital number, since it uses as much as digits as its factorization.

71687970749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37340352, while the sum is 65.

The spelling of 71687970749 in words is "seventy-one billion, six hundred eighty-seven million, nine hundred seventy thousand, seven hundred forty-nine".