19667481540 has 192 divisors, whose sum is σ = 63750855168. Its totient is φ = 4437504000.

The previous prime is 19667481527. The next prime is 19667481601. The reversal of 19667481540 is 4518476691.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22948792 + ... + 22949648.

It is an arithmetic number, because the mean of its divisors is an integer number (332035704).

Almost surely, 2^19667481540 is an apocalyptic number.

19667481540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19667481540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31875427584).

19667481540 is an abundant number, since it is smaller than the sum of its proper divisors (44083373628).

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

19667481540 is a wasteful number, since it uses less digits than its factorization.

19667481540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 19667481540 in words is "nineteen billion, six hundred sixty-seven million, four hundred eighty-one thousand, five hundred forty".