66619199520 has 96 divisors (see below), whose sum is σ = 233167213440. Its totient is φ = 17765118720.

The previous prime is 66619199513. The next prime is 66619199527. The reversal of 66619199520 is 2599191666.

It is an interprime number because it is at equal distance from previous prime (66619199513) and next prime (66619199527).

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

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

It is not an unprimeable number, because it can be changed into a prime (66619199527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7706236 + ... + 7714875.

It is an arithmetic number, because the mean of its divisors is an integer number (2428825140).

Almost surely, 2^66619199520 is an apocalyptic number.

66619199520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66619199520 is an abundant number, since it is smaller than the sum of its proper divisors (166548013920).

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

66619199520 is a wasteful number, since it uses less digits than its factorization.

66619199520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15421135 (or 15421121 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 66619199520 in words is "sixty-six billion, six hundred nineteen million, one hundred ninety-nine thousand, five hundred twenty".