18257207217 has 64 divisors (see below), whose sum is σ = 26892902400. Its totient is φ = 10977223680.

The previous prime is 18257207197. The next prime is 18257207233. The reversal of 18257207217 is 71270275281.

It is not a de Polignac number, because 18257207217 - 2⁶ = 18257207153 is a prime.

It is a super-4 number, since 4×18257207217⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (18257205217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17571384 + ... + 17572422.

It is an arithmetic number, because the mean of its divisors is an integer number (420201600).

Almost surely, 2^18257207217 is an apocalyptic number.

It is an amenable number.

18257207217 is a deficient number, since it is larger than the sum of its proper divisors (8635695183).

18257207217 is a wasteful number, since it uses less digits than its factorization.

18257207217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 109760, while the sum is 42.

The spelling of 18257207217 in words is "eighteen billion, two hundred fifty-seven million, two hundred seven thousand, two hundred seventeen".