16705621440 has 140 divisors (see below), whose sum is σ = 59424926616. Its totient is φ = 4454825472.

The previous prime is 16705621433. The next prime is 16705621451. The reversal of 16705621440 is 4412650761.

16705621440 is a `hidden beast` number, since 16 + 70 + 562 + 14 + 4 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16705621395 and 16705621404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 296334 + ... + 348173.

Almost surely, 2^16705621440 is an apocalyptic number.

16705621440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16705621440 is an abundant number, since it is smaller than the sum of its proper divisors (42719305176).

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

16705621440 is an equidigital number, since it uses as much as digits as its factorization.

16705621440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644536 (or 644517 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 16705621440 in words is "sixteen billion, seven hundred five million, six hundred twenty-one thousand, four hundred forty".