65774370816 has 480 divisors, whose sum is σ = 243094440960. Its totient is φ = 17075404800.

The previous prime is 65774370797. The next prime is 65774370839. The reversal of 65774370816 is 61807347756.

65774370816 is a `hidden beast` number, since 65 + 77 + 437 + 0 + 81 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34061371 + ... + 34063301.

It is an arithmetic number, because the mean of its divisors is an integer number (506446752).

Almost surely, 2^65774370816 is an apocalyptic number.

65774370816 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 65774370816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121547220480).

65774370816 is an abundant number, since it is smaller than the sum of its proper divisors (177320070144).

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

65774370816 is a wasteful number, since it uses less digits than its factorization.

65774370816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986 (or 1954 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 65774370816 in words is "sixty-five billion, seven hundred seventy-four million, three hundred seventy thousand, eight hundred sixteen".