18901958890 has 16 divisors (see below), whose sum is σ = 34038302760. Its totient is φ = 7557499840.

The previous prime is 18901958869. The next prime is 18901958891. The reversal of 18901958890 is 9885910981.

It can be written as a sum of positive squares in 4 ways, for example, as 16803677641 + 2098281249 = 129629^2 + 45807^2 .

It is not an unprimeable number, because it can be changed into a prime (18901958891) 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, 386221 + ... + 432400.

Almost surely, 2^18901958890 is an apocalyptic number.

18901958890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18901958890 is a deficient number, since it is larger than the sum of its proper divisors (15136343870).

18901958890 is a wasteful number, since it uses less digits than its factorization.

18901958890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820937.

The product of its (nonzero) digits is 1866240, while the sum is 58.

The spelling of 18901958890 in words is "eighteen billion, nine hundred one million, nine hundred fifty-eight thousand, eight hundred ninety".