257472769909 has 2 divisors, whose sum is σ = 257472769910. Its totient is φ = 257472769908.

The previous prime is 257472769889. The next prime is 257472769949. The reversal of 257472769909 is 909967274752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219300207025 + 38172562884 = 468295^2 + 195378^2 .

It is a cyclic number.

It is not a de Polignac number, because 257472769909 - 2²¹ = 257470672757 is a prime.

It is a super-2 number, since 2×257472769909² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257472769949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128736384954 + 128736384955.

It is an arithmetic number, because the mean of its divisors is an integer number (128736384955).

Almost surely, 2^257472769909 is an apocalyptic number.

It is an amenable number.

257472769909 is a deficient number, since it is larger than the sum of its proper divisors (1).

257472769909 is an equidigital number, since it uses as much as digits as its factorization.

257472769909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120022560, while the sum is 67.

The spelling of 257472769909 in words is "two hundred fifty-seven billion, four hundred seventy-two million, seven hundred sixty-nine thousand, nine hundred nine".