671815422457 has 2 divisors, whose sum is σ = 671815422458. Its totient is φ = 671815422456.

The previous prime is 671815422407. The next prime is 671815422463. The reversal of 671815422457 is 754224518176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 593941496976 + 77873925481 = 770676^2 + 279059^2 .

It is a cyclic number.

It is not a de Polignac number, because 671815422457 - 2³¹ = 669667938809 is a prime.

It is not a weakly prime, because it can be changed into another prime (671815422407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335907711228 + 335907711229.

It is an arithmetic number, because the mean of its divisors is an integer number (335907711229).

Almost surely, 2^671815422457 is an apocalyptic number.

It is an amenable number.

671815422457 is a deficient number, since it is larger than the sum of its proper divisors (1).

671815422457 is an equidigital number, since it uses as much as digits as its factorization.

671815422457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3763200, while the sum is 52.

The spelling of 671815422457 in words is "six hundred seventy-one billion, eight hundred fifteen million, four hundred twenty-two thousand, four hundred fifty-seven".