7771665268664 has 128 divisors (see below), whose sum is σ = 16099537259520. Its totient is φ = 3516835069440.

The previous prime is 7771665268649. The next prime is 7771665268667. The reversal of 7771665268664 is 4668625661777.

Its product of digits (853493760) is a multiple of the sum of its prime divisors (3584).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7771665268667) 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, 3398190929 + ... + 3398193215.

It is an arithmetic number, because the mean of its divisors is an integer number (125777634840).

Almost surely, 2^{7771665268664} 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 7771665268664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8049768629760).

7771665268664 is an abundant number, since it is smaller than the sum of its proper divisors (8327871990856).

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

7771665268664 is a wasteful number, since it uses less digits than its factorization.

7771665268664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610 (or 3584 counting only the distinct ones).

The product of its digits is 853493760, while the sum is 71.

The spelling of 7771665268664 in words is "seven trillion, seven hundred seventy-one billion, six hundred sixty-five million, two hundred sixty-eight thousand, six hundred sixty-four".