71957012213 has 2 divisors, whose sum is σ = 71957012214. Its totient is φ = 71957012212.

The previous prime is 71957012189. The next prime is 71957012279. The reversal of 71957012213 is 31221075917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52440084004 + 19516928209 = 228998^2 + 139703^2 .

It is a cyclic number.

It is not a de Polignac number, because 71957012213 - 2¹⁴ = 71956995829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71957312213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35978506106 + 35978506107.

It is an arithmetic number, because the mean of its divisors is an integer number (35978506107).

Almost surely, 2^71957012213 is an apocalyptic number.

It is an amenable number.

71957012213 is a deficient number, since it is larger than the sum of its proper divisors (1).

71957012213 is an equidigital number, since it uses as much as digits as its factorization.

71957012213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 38.

The spelling of 71957012213 in words is "seventy-one billion, nine hundred fifty-seven million, twelve thousand, two hundred thirteen".