257256652747 has 2 divisors, whose sum is σ = 257256652748. Its totient is φ = 257256652746.

The previous prime is 257256652729. The next prime is 257256652753. The reversal of 257256652747 is 747256652752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257256652747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257256652691 and 257256652700.

It is not a weakly prime, because it can be changed into another prime (257256652547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128628326373 + 128628326374.

It is an arithmetic number, because the mean of its divisors is an integer number (128628326374).

Almost surely, 2^257256652747 is an apocalyptic number.

257256652747 is a deficient number, since it is larger than the sum of its proper divisors (1).

257256652747 is an equidigital number, since it uses as much as digits as its factorization.

257256652747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392000, while the sum is 58.

The spelling of 257256652747 in words is "two hundred fifty-seven billion, two hundred fifty-six million, six hundred fifty-two thousand, seven hundred forty-seven".