19668521088 has 96 divisors (see below), whose sum is σ = 58694541360. Its totient is φ = 6556163328.

The previous prime is 19668521077. The next prime is 19668521101. The reversal of 19668521088 is 88012586691.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285070 + ... + 347277.

Almost surely, 2^19668521088 is an apocalyptic number.

19668521088 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19668521088 is an abundant number, since it is smaller than the sum of its proper divisors (39026020272).

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

19668521088 is an frugal number, since it uses more digits than its factorization.

19668521088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632376 (or 632352 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 19668521088 in words is "nineteen billion, six hundred sixty-eight million, five hundred twenty-one thousand, eighty-eight".