257421307326730 has 64 divisors (see below), whose sum is σ = 483807283344000. Its totient is φ = 98490831199488.

The previous prime is 257421307326727. The next prime is 257421307326809. The reversal of 257421307326730 is 37623703124752.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208611417 + ... + 209841763.

It is an arithmetic number, because the mean of its divisors is an integer number (7559488802250).

Almost surely, 2^{257421307326730} is an apocalyptic number.

257421307326730 is a deficient number, since it is larger than the sum of its proper divisors (226385976017270).

257421307326730 is a wasteful number, since it uses less digits than its factorization.

257421307326730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237111.

The product of its (nonzero) digits is 8890560, while the sum is 52.

The spelling of 257421307326730 in words is "two hundred fifty-seven trillion, four hundred twenty-one billion, three hundred seven million, three hundred twenty-six thousand, seven hundred thirty".