64774647696 has 160 divisors (see below), whose sum is σ = 196842401280. Its totient is φ = 18141926400.

The previous prime is 64774647659. The next prime is 64774647697. The reversal of 64774647696 is 69674647746.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (64774647697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 332571 + ... + 490053.

It is an arithmetic number, because the mean of its divisors is an integer number (1230265008).

Almost surely, 2^64774647696 is an apocalyptic number.

64774647696 is a gapful number since it is divisible by the number (66) 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 64774647696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98421200640).

64774647696 is an abundant number, since it is smaller than the sum of its proper divisors (132067753584).

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

64774647696 is a wasteful number, since it uses less digits than its factorization.

64774647696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157565 (or 157559 counting only the distinct ones).

The product of its digits is 256048128, while the sum is 66.

The spelling of 64774647696 in words is "sixty-four billion, seven hundred seventy-four million, six hundred forty-seven thousand, six hundred ninety-six".