257212154834 has 4 divisors (see below), whose sum is σ = 385818232254. Its totient is φ = 128606077416.

The previous prime is 257212154813. The next prime is 257212154839. The reversal of 257212154834 is 438451212752.

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

It can be written as a sum of positive squares in only one way, i.e., 156629935225 + 100582219609 = 395765^2 + 317147^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257212154839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64303038707 + ... + 64303038710.

Almost surely, 2^257212154834 is an apocalyptic number.

257212154834 is a deficient number, since it is larger than the sum of its proper divisors (128606077420).

257212154834 is a wasteful number, since it uses less digits than its factorization.

257212154834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128606077419.

The product of its digits is 537600, while the sum is 44.

The spelling of 257212154834 in words is "two hundred fifty-seven billion, two hundred twelve million, one hundred fifty-four thousand, eight hundred thirty-four".