16653978432 has 560 divisors, whose sum is σ = 62248889472. Its totient is φ = 4284887040.

The previous prime is 16653978421. The next prime is 16653978479. The reversal of 16653978432 is 23487935661.

16653978432 is a `hidden beast` number, since 1 + 6 + 6 + 539 + 78 + 4 + 32 = 666.

It is a super-2 number, since 2×16653978432² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20284582 + ... + 20285402.

Almost surely, 2^16653978432 is an apocalyptic number.

16653978432 is a gapful number since it is divisible by the number (12) 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 16653978432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31124444736).

16653978432 is an abundant number, since it is smaller than the sum of its proper divisors (45594911040).

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

16653978432 is a wasteful number, since it uses less digits than its factorization.

16653978432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908 (or 889 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 16653978432 in words is "sixteen billion, six hundred fifty-three million, nine hundred seventy-eight thousand, four hundred thirty-two".