257747640187 has 16 divisors (see below), whose sum is σ = 272764347520. Its totient is φ = 242879472000.

The previous prime is 257747640173. The next prime is 257747640223. The reversal of 257747640187 is 781046747752.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257747640187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257747640287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2675812 + ... + 2770462.

It is an arithmetic number, because the mean of its divisors is an integer number (17047771720).

Almost surely, 2^257747640187 is an apocalyptic number.

257747640187 is a deficient number, since it is larger than the sum of its proper divisors (15016707333).

257747640187 is a wasteful number, since it uses less digits than its factorization.

257747640187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95434.

The product of its (nonzero) digits is 18439680, while the sum is 58.

The spelling of 257747640187 in words is "two hundred fifty-seven billion, seven hundred forty-seven million, six hundred forty thousand, one hundred eighty-seven".