18912961490 has 32 divisors (see below), whose sum is σ = 34707087360. Its totient is φ = 7417859904.

The previous prime is 18912961481. The next prime is 18912961493. The reversal of 18912961490 is 9416921981.

It is a super-2 number, since 2×18912961490² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18912961493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 922127 + ... + 942413.

It is an arithmetic number, because the mean of its divisors is an integer number (1084596480).

Almost surely, 2^18912961490 is an apocalyptic number.

18912961490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18912961490 is a deficient number, since it is larger than the sum of its proper divisors (15794125870).

18912961490 is a wasteful number, since it uses less digits than its factorization.

18912961490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22106.

The product of its (nonzero) digits is 279936, while the sum is 50.

The spelling of 18912961490 in words is "eighteen billion, nine hundred twelve million, nine hundred sixty-one thousand, four hundred ninety".