18497681642 has 16 divisors (see below), whose sum is σ = 30519094464. Its totient is φ = 8408035900.

The previous prime is 18497681569. The next prime is 18497681659. The reversal of 18497681642 is 24618679481.

It is a happy number.

It is a super-2 number, since 2×18497681642² (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 7 ways as a sum of consecutive naturals, for example, 3471734 + ... + 3477057.

It is an arithmetic number, because the mean of its divisors is an integer number (1907443404).

Almost surely, 2^18497681642 is an apocalyptic number.

18497681642 is a deficient number, since it is larger than the sum of its proper divisors (12021412822).

18497681642 is an equidigital number, since it uses as much as digits as its factorization.

18497681642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6948826 (or 6948804 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 56.

The spelling of 18497681642 in words is "eighteen billion, four hundred ninety-seven million, six hundred eighty-one thousand, six hundred forty-two".