71155556514457 has 2 divisors, whose sum is σ = 71155556514458. Its totient is φ = 71155556514456.

The previous prime is 71155556514431. The next prime is 71155556514479. The reversal of 71155556514457 is 75441565555117.

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., 68427704586816 + 2727851927641 = 8272104^2 + 1651621^2 .

It is a cyclic number.

It is not a de Polignac number, because 71155556514457 - 2¹¹ = 71155556512409 is a prime.

It is a super-2 number, since 2×71155556514457² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71155556514395 and 71155556514404.

It is not a weakly prime, because it can be changed into another prime (71155556514407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35577778257228 + 35577778257229.

It is an arithmetic number, because the mean of its divisors is an integer number (35577778257229).

Almost surely, 2^{71155556514457} is an apocalyptic number.

It is an amenable number.

71155556514457 is a deficient number, since it is larger than the sum of its proper divisors (1).

71155556514457 is an equidigital number, since it uses as much as digits as its factorization.

71155556514457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73500000, while the sum is 61.

The spelling of 71155556514457 in words is "seventy-one trillion, one hundred fifty-five billion, five hundred fifty-six million, five hundred fourteen thousand, four hundred fifty-seven".