18642478756 has 12 divisors (see below), whose sum is σ = 35590186800. Its totient is φ = 8473853960.

The previous prime is 18642478753. The next prime is 18642478759. The reversal of 18642478756 is 65787424681.

It is an interprime number because it is at equal distance from previous prime (18642478753) and next prime (18642478759).

It is a super-2 number, since 2×18642478756² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18642478756.

It is not an unprimeable number, because it can be changed into a prime (18642478753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211846306 + ... + 211846393.

It is an arithmetic number, because the mean of its divisors is an integer number (2965848900).

Almost surely, 2^18642478756 is an apocalyptic number.

It is an amenable number.

18642478756 is a deficient number, since it is larger than the sum of its proper divisors (16947708044).

18642478756 is a wasteful number, since it uses less digits than its factorization.

18642478756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423692714 (or 423692712 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 58.

The spelling of 18642478756 in words is "eighteen billion, six hundred forty-two million, four hundred seventy-eight thousand, seven hundred fifty-six".