71842748557 has 2 divisors, whose sum is σ = 71842748558. Its totient is φ = 71842748556.

The previous prime is 71842748507. The next prime is 71842748573. The reversal of 71842748557 is 75584724817.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66796919401 + 5045829156 = 258451^2 + 71034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71842748557 is a prime.

It is a super-2 number, since 2×71842748557² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71842748507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35921374278 + 35921374279.

It is an arithmetic number, because the mean of its divisors is an integer number (35921374279).

Almost surely, 2^71842748557 is an apocalyptic number.

It is an amenable number.

71842748557 is a deficient number, since it is larger than the sum of its proper divisors (1).

71842748557 is an equidigital number, since it uses as much as digits as its factorization.

71842748557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17561600, while the sum is 58.

The spelling of 71842748557 in words is "seventy-one billion, eight hundred forty-two million, seven hundred forty-eight thousand, five hundred fifty-seven".