16393178640 has 80 divisors (see below), whose sum is σ = 51534665856. Its totient is φ = 4309939200.

The previous prime is 16393178611. The next prime is 16393178687. The reversal of 16393178640 is 4687139361.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 16393178640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463981 + ... + 498060.

Almost surely, 2^16393178640 is an apocalyptic number.

16393178640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16393178640 is an abundant number, since it is smaller than the sum of its proper divisors (35141487216).

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

16393178640 is a wasteful number, since it uses less digits than its factorization.

16393178640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962128 (or 962122 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 16393178640 in words is "sixteen billion, three hundred ninety-three million, one hundred seventy-eight thousand, six hundred forty".