19530619864 has 32 divisors (see below), whose sum is σ = 44313173280. Its totient is φ = 7877896704.

The previous prime is 19530619819. The next prime is 19530619877. The reversal of 19530619864 is 46891603591.

It is a super-2 number, since 2×19530619864² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10256727 + ... + 10258630.

It is an arithmetic number, because the mean of its divisors is an integer number (1384786665).

Almost surely, 2^19530619864 is an apocalyptic number.

19530619864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19530619864 is an abundant number, since it is smaller than the sum of its proper divisors (24782553416).

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

19530619864 is a wasteful number, since it uses less digits than its factorization.

19530619864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20515387 (or 20515383 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 19530619864 in words is "nineteen billion, five hundred thirty million, six hundred nineteen thousand, eight hundred sixty-four".