65402077686 has 16 divisors (see below), whose sum is σ = 142695442368. Its totient is φ = 19818811400.

The previous prime is 65402077681. The next prime is 65402077687. The reversal of 65402077686 is 68677020456.

65402077686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×65402077686² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65402077681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495470220 + ... + 495470351.

It is an arithmetic number, because the mean of its divisors is an integer number (8918465148).

Almost surely, 2^65402077686 is an apocalyptic number.

65402077686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

65402077686 is an abundant number, since it is smaller than the sum of its proper divisors (77293364682).

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

65402077686 is a wasteful number, since it uses less digits than its factorization.

65402077686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990940587.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 65402077686 in words is "sixty-five billion, four hundred two million, seventy-seven thousand, six hundred eighty-six".