19812180640 has 48 divisors (see below), whose sum is σ = 53492890752. Its totient is φ = 6792747264.

The previous prime is 19812180623. The next prime is 19812180659. The reversal of 19812180640 is 4608121891.

It is a super-3 number, since 3×19812180640³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 19812180593 and 19812180602.

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, 8843604 + ... + 8845843.

It is an arithmetic number, because the mean of its divisors is an integer number (1114435224).

Almost surely, 2^19812180640 is an apocalyptic number.

19812180640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19812180640 is an abundant number, since it is smaller than the sum of its proper divisors (33680710112).

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

19812180640 is a wasteful number, since it uses less digits than its factorization.

19812180640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17689469 (or 17689461 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The spelling of 19812180640 in words is "nineteen billion, eight hundred twelve million, one hundred eighty thousand, six hundred forty".