257754308138 has 8 divisors (see below), whose sum is σ = 386644656420. Its totient is φ = 128872756000.

The previous prime is 257754308137. The next prime is 257754308143. The reversal of 257754308138 is 831803457752.

It can be written as a sum of positive squares in 2 ways, for example, as 249417339889 + 8336968249 = 499417^2 + 91307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 257754308138.

It is not an unprimeable number, because it can be changed into a prime (257754308137) 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, 2125283 + ... + 2243286.

Almost surely, 2^257754308138 is an apocalyptic number.

257754308138 is a deficient number, since it is larger than the sum of its proper divisors (128890348282).

257754308138 is a wasteful number, since it uses less digits than its factorization.

257754308138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4398072.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 257754308138 in words is "two hundred fifty-seven billion, seven hundred fifty-four million, three hundred eight thousand, one hundred thirty-eight".