71951478125557 has 2 divisors, whose sum is σ = 71951478125558. Its totient is φ = 71951478125556.

The previous prime is 71951478125531. The next prime is 71951478125587. The reversal of 71951478125557 is 75552187415917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71295833266596 + 655644858961 = 8443686^2 + 809719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71951478125557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71951478125492 and 71951478125501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71951478125587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35975739062778 + 35975739062779.

It is an arithmetic number, because the mean of its divisors is an integer number (35975739062779).

Almost surely, 2^{71951478125557} is an apocalyptic number.

It is an amenable number.

71951478125557 is a deficient number, since it is larger than the sum of its proper divisors (1).

71951478125557 is an equidigital number, since it uses as much as digits as its factorization.

71951478125557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480000, while the sum is 67.

The spelling of 71951478125557 in words is "seventy-one trillion, nine hundred fifty-one billion, four hundred seventy-eight million, one hundred twenty-five thousand, five hundred fifty-seven".