18820900979 has 4 divisors (see below), whose sum is σ = 19014930984. Its totient is φ = 18626870976.

The previous prime is 18820900937. The next prime is 18820900993. The reversal of 18820900979 is 97900902881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18820900979 - 2¹² = 18820896883 is a prime.

It is a super-2 number, since 2×18820900979² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18820900979.

It is not an unprimeable number, because it can be changed into a prime (18820980979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97014857 + ... + 97015050.

It is an arithmetic number, because the mean of its divisors is an integer number (4753732746).

Almost surely, 2^18820900979 is an apocalyptic number.

18820900979 is a deficient number, since it is larger than the sum of its proper divisors (194030005).

18820900979 is an equidigital number, since it uses as much as digits as its factorization.

18820900979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194030004.

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 18820900979 in words is "eighteen billion, eight hundred twenty million, nine hundred thousand, nine hundred seventy-nine".