15649374939840 has 336 divisors, whose sum is σ = 57227427661248. Its totient is φ = 3916408184832.

The previous prime is 15649374939763. The next prime is 15649374939853. The reversal of 15649374939840 is 4893947394651.

15649374939840 is a `hidden beast` number, since 1 + 5 + 6 + 4 + 9 + 3 + 7 + 493 + 98 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1281922 + ... + 5739518.

Almost surely, 2^{15649374939840} is an apocalyptic number.

15649374939840 is a gapful number since it is divisible by the number (10) 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 15649374939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28613713830624).

15649374939840 is an abundant number, since it is smaller than the sum of its proper divisors (41578052721408).

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

15649374939840 is a wasteful number, since it uses less digits than its factorization.

15649374939840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457696 (or 4457683 counting only the distinct ones).

The product of its (nonzero) digits is 705438720, while the sum is 72.

The spelling of 15649374939840 in words is "fifteen trillion, six hundred forty-nine billion, three hundred seventy-four million, nine hundred thirty-nine thousand, eight hundred forty".