18950826640 has 40 divisors (see below), whose sum is σ = 44165407608. Its totient is φ = 7562311680.

The previous prime is 18950826623. The next prime is 18950826641. The reversal of 18950826640 is 4662805981.

It can be written as a sum of positive squares in 4 ways, for example, as 1924752384 + 17026074256 = 43872^2 + 130484^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18950826641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247657 + ... + 315016.

Almost surely, 2^18950826640 is an apocalyptic number.

18950826640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18950826640 is an abundant number, since it is smaller than the sum of its proper divisors (25214580968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18950826640 is a wasteful number, since it uses less digits than its factorization.

18950826640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563107 (or 563101 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 18950826640 in words is "eighteen billion, nine hundred fifty million, eight hundred twenty-six thousand, six hundred forty".