18950133257 has 16 divisors (see below), whose sum is σ = 21898397952. Its totient is φ = 16207000320.

The previous prime is 18950133247. The next prime is 18950133263. The reversal of 18950133257 is 75233105981.

It is not a de Polignac number, because 18950133257 - 2³² = 14655165961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18950133217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436883 + ... + 478295.

It is an arithmetic number, because the mean of its divisors is an integer number (1368649872).

Almost surely, 2^18950133257 is an apocalyptic number.

18950133257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18950133257 is a deficient number, since it is larger than the sum of its proper divisors (2948264695).

18950133257 is a wasteful number, since it uses less digits than its factorization.

18950133257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43888.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 18950133257 in words is "eighteen billion, nine hundred fifty million, one hundred thirty-three thousand, two hundred fifty-seven".