18440475650 has 72 divisors (see below), whose sum is σ = 36523911204. Its totient is φ = 6925363200.

The previous prime is 18440475629. The next prime is 18440475689. The reversal of 18440475650 is 5657404481.

It can be written as a sum of positive squares in 6 ways, for example, as 7074996769 + 11365478881 = 84113^2 + 106609^2 .

It is a super-2 number, since 2×18440475650² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2035130 + ... + 2044170.

Almost surely, 2^18440475650 is an apocalyptic number.

18440475650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18440475650 is a deficient number, since it is larger than the sum of its proper divisors (18083435554).

18440475650 is a wasteful number, since it uses less digits than its factorization.

18440475650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9204 (or 9180 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 18440475650 in words is "eighteen billion, four hundred forty million, four hundred seventy-five thousand, six hundred fifty".