71556164039 has 2 divisors, whose sum is σ = 71556164040. Its totient is φ = 71556164038.

The previous prime is 71556164003. The next prime is 71556164093. The reversal of 71556164039 is 93046165517.

Together with next prime (71556164093) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71556164039 - 2¹⁶ = 71556098503 is a prime.

It is a super-2 number, since 2×71556164039² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71556163984 and 71556164002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71556169039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35778082019 + 35778082020.

It is an arithmetic number, because the mean of its divisors is an integer number (35778082020).

Almost surely, 2^71556164039 is an apocalyptic number.

71556164039 is a deficient number, since it is larger than the sum of its proper divisors (1).

71556164039 is an equidigital number, since it uses as much as digits as its factorization.

71556164039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 71556164039 in words is "seventy-one billion, five hundred fifty-six million, one hundred sixty-four thousand, thirty-nine".