257235690087 has 8 divisors (see below), whose sum is σ = 381089911280. Its totient is φ = 171490460040.

The previous prime is 257235690079. The next prime is 257235690091. The reversal of 257235690087 is 780096532752.

257235690087 is a `hidden beast` number, since 2 + 5 + 72 + 3 + 569 + 0 + 0 + 8 + 7 = 666.

It is not a de Polignac number, because 257235690087 - 2³ = 257235690079 is a prime.

It is a super-2 number, since 2×257235690087² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257235690017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4763623864 + ... + 4763623917.

It is an arithmetic number, because the mean of its divisors is an integer number (47636238910).

Almost surely, 2^257235690087 is an apocalyptic number.

257235690087 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

257235690087 is a deficient number, since it is larger than the sum of its proper divisors (123854221193).

257235690087 is an equidigital number, since it uses as much as digits as its factorization.

257235690087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9527247790 (or 9527247784 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 257235690087 in words is "two hundred fifty-seven billion, two hundred thirty-five million, six hundred ninety thousand, eighty-seven".