18621978468 has 24 divisors (see below), whose sum is σ = 43576512672. Its totient is φ = 6189436224.

The previous prime is 18621978467. The next prime is 18621978469. The reversal of 18621978468 is 86487912681.

It is an interprime number because it is at equal distance from previous prime (18621978467) and next prime (18621978469).

It is not an unprimeable number, because it can be changed into a prime (18621978461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2231905 + ... + 2240232.

It is an arithmetic number, because the mean of its divisors is an integer number (1815688028).

Almost surely, 2^18621978468 is an apocalyptic number.

It is an amenable number.

18621978468 is an abundant number, since it is smaller than the sum of its proper divisors (24954534204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18621978468 is a wasteful number, since it uses less digits than its factorization.

18621978468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472491 (or 4472489 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 60.

The spelling of 18621978468 in words is "eighteen billion, six hundred twenty-one million, nine hundred seventy-eight thousand, four hundred sixty-eight".