18954619690 has 16 divisors (see below), whose sum is σ = 34125121800. Its totient is φ = 7580335360.

The previous prime is 18954619681. The next prime is 18954619699. The reversal of 18954619690 is 9691645981.

It is an interprime number because it is at equal distance from previous prime (18954619681) and next prime (18954619699).

It can be written as a sum of positive squares in 4 ways, for example, as 11762053209 + 7192566481 = 108453^2 + 84809^2 .

It is a super-2 number, since 2×18954619690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18954619699) 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, 135715 + ... + 237334.

Almost surely, 2^18954619690 is an apocalyptic number.

18954619690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18954619690 is a deficient number, since it is larger than the sum of its proper divisors (15170502110).

18954619690 is a wasteful number, since it uses less digits than its factorization.

18954619690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378137.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 18954619690 in words is "eighteen billion, nine hundred fifty-four million, six hundred nineteen thousand, six hundred ninety".