257739977242 has 16 divisors (see below), whose sum is σ = 424442678112. Its totient is φ = 116408326320.

The previous prime is 257739977191. The next prime is 257739977281. The reversal of 257739977242 is 242779937752.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37306908 + ... + 37313815.

It is an arithmetic number, because the mean of its divisors is an integer number (26527667382).

Almost surely, 2^257739977242 is an apocalyptic number.

257739977242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

257739977242 is a deficient number, since it is larger than the sum of its proper divisors (166702700870).

257739977242 is a wasteful number, since it uses less digits than its factorization.

257739977242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74620893.

The product of its digits is 93350880, while the sum is 64.

The spelling of 257739977242 in words is "two hundred fifty-seven billion, seven hundred thirty-nine million, nine hundred seventy-seven thousand, two hundred forty-two".