71890211537 has 2 divisors, whose sum is σ = 71890211538. Its totient is φ = 71890211536.

The previous prime is 71890211527. The next prime is 71890211563. The reversal of 71890211537 is 73511209817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51567143056 + 20323068481 = 227084^2 + 142559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71890211537 is a prime.

It is not a weakly prime, because it can be changed into another prime (71890211527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35945105768 + 35945105769.

It is an arithmetic number, because the mean of its divisors is an integer number (35945105769).

Almost surely, 2^71890211537 is an apocalyptic number.

It is an amenable number.

71890211537 is a deficient number, since it is larger than the sum of its proper divisors (1).

71890211537 is an equidigital number, since it uses as much as digits as its factorization.

71890211537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 71890211537 in words is "seventy-one billion, eight hundred ninety million, two hundred eleven thousand, five hundred thirty-seven".