57172561969 has 2 divisors, whose sum is σ = 57172561970. Its totient is φ = 57172561968.

The previous prime is 57172561891. The next prime is 57172562021. The reversal of 57172561969 is 96916527175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57168810000 + 3751969 = 239100^2 + 1937^2 .

It is a cyclic number.

It is not a de Polignac number, because 57172561969 - 2¹⁷ = 57172430897 is a prime.

It is a super-2 number, since 2×57172561969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (57172561669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28586280984 + 28586280985.

It is an arithmetic number, because the mean of its divisors is an integer number (28586280985).

Almost surely, 2^57172561969 is an apocalyptic number.

It is an amenable number.

57172561969 is a deficient number, since it is larger than the sum of its proper divisors (1).

57172561969 is an equidigital number, since it uses as much as digits as its factorization.

57172561969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7144200, while the sum is 58.

The spelling of 57172561969 in words is "fifty-seven billion, one hundred seventy-two million, five hundred sixty-one thousand, nine hundred sixty-nine".