77646443271936 has 432 divisors, whose sum is σ = 262938292928640. Its totient is φ = 20114653224960.

The previous prime is 77646443271877. The next prime is 77646443271941. The reversal of 77646443271936 is 63917234464677.

It is a congruent number.

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, 156640350 + ... + 157135266.

Almost surely, 2^{77646443271936} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77646443271936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131469146464320).

77646443271936 is an abundant number, since it is smaller than the sum of its proper divisors (185291849656704).

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

77646443271936 is a wasteful number, since it uses less digits than its factorization.

77646443271936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495340 (or 495319 counting only the distinct ones).

The product of its digits is 768144384, while the sum is 69.

The spelling of 77646443271936 in words is "seventy-seven trillion, six hundred forty-six billion, four hundred forty-three million, two hundred seventy-one thousand, nine hundred thirty-six".