257434195049 has 4 divisors (see below), whose sum is σ = 257446484736. Its totient is φ = 257421905364.

The previous prime is 257434195033. The next prime is 257434195141. The reversal of 257434195049 is 940591434752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257434195049 - 2⁴ = 257434195033 is a prime.

It is a super-2 number, since 2×257434195049² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257434195649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6113369 + ... + 6155334.

It is an arithmetic number, because the mean of its divisors is an integer number (64361621184).

Almost surely, 2^257434195049 is an apocalyptic number.

It is an amenable number.

257434195049 is a deficient number, since it is larger than the sum of its proper divisors (12289687).

257434195049 is a wasteful number, since it uses less digits than its factorization.

257434195049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12289686.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 257434195049 in words is "two hundred fifty-seven billion, four hundred thirty-four million, one hundred ninety-five thousand, forty-nine".