257147423251 has 4 divisors (see below), whose sum is σ = 257285158072. Its totient is φ = 257009688432.

The previous prime is 257147423243. The next prime is 257147423287. The reversal of 257147423251 is 152324741752.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 257147423251 - 2³ = 257147423243 is a prime.

It is a super-2 number, since 2×257147423251² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257147423198 and 257147423207.

It is not an unprimeable number, because it can be changed into a prime (257147423201) 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, 68864610 + ... + 68868343.

It is an arithmetic number, because the mean of its divisors is an integer number (64321289518).

Almost surely, 2^257147423251 is an apocalyptic number.

257147423251 is a deficient number, since it is larger than the sum of its proper divisors (137734821).

257147423251 is a wasteful number, since it uses less digits than its factorization.

257147423251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137734820.

The product of its digits is 470400, while the sum is 43.

The spelling of 257147423251 in words is "two hundred fifty-seven billion, one hundred forty-seven million, four hundred twenty-three thousand, two hundred fifty-one".