257427456733 has 4 divisors (see below), whose sum is σ = 257556365820. Its totient is φ = 257298547648.

The previous prime is 257427456719. The next prime is 257427456743. The reversal of 257427456733 is 337654724752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83415837124 + 174011619609 = 288818^2 + 417147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257427456733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257427456743) 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, 64451548 + ... + 64455541.

It is an arithmetic number, because the mean of its divisors is an integer number (64389091455).

Almost surely, 2^257427456733 is an apocalyptic number.

It is an amenable number.

257427456733 is a deficient number, since it is larger than the sum of its proper divisors (128909087).

257427456733 is a wasteful number, since it uses less digits than its factorization.

257427456733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128909086.

The product of its digits is 29635200, while the sum is 55.

The spelling of 257427456733 in words is "two hundred fifty-seven billion, four hundred twenty-seven million, four hundred fifty-six thousand, seven hundred thirty-three".