18001961379 has 12 divisors (see below), whose sum is σ = 27133391376. Its totient is φ = 11479511472.

The previous prime is 18001961359. The next prime is 18001961399. The reversal of 18001961379 is 97316910081.

18001961379 is a `hidden beast` number, since 18 + 0 + 0 + 19 + 613 + 7 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (18001961359) and next prime (18001961399).

It is not a de Polignac number, because 18001961379 - 2⁵ = 18001961347 is a prime.

It is a super-2 number, since 2×18001961379² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18001961359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43482792 + ... + 43483205.

It is an arithmetic number, because the mean of its divisors is an integer number (2261115948).

Almost surely, 2^18001961379 is an apocalyptic number.

18001961379 is a deficient number, since it is larger than the sum of its proper divisors (9131429997).

18001961379 is a wasteful number, since it uses less digits than its factorization.

18001961379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86966026 (or 86966023 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The spelling of 18001961379 in words is "eighteen billion, one million, nine hundred sixty-one thousand, three hundred seventy-nine".