39849778656 has 240 divisors, whose sum is σ = 122943744000. Its totient is φ = 12638115072.

The previous prime is 39849778609. The next prime is 39849778691. The reversal of 39849778656 is 65687794893.

39849778656 is a `hidden beast` number, since 3 + 9 + 8 + 497 + 7 + 86 + 56 = 666.

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

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 39 ways as a sum of consecutive naturals, for example, 11861905 + ... + 11865263.

It is an arithmetic number, because the mean of its divisors is an integer number (512265600).

Almost surely, 2^39849778656 is an apocalyptic number.

39849778656 is a gapful number since it is divisible by the number (36) 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 39849778656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61471872000).

39849778656 is an abundant number, since it is smaller than the sum of its proper divisors (83093965344).

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

39849778656 is a wasteful number, since it uses less digits than its factorization.

39849778656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603 (or 3586 counting only the distinct ones).

The product of its digits is 548674560, while the sum is 72.

The spelling of 39849778656 in words is "thirty-nine billion, eight hundred forty-nine million, seven hundred seventy-eight thousand, six hundred fifty-six".