65642776399 has 4 divisors (see below), whose sum is σ = 67039431264. Its totient is φ = 64246121536.

The previous prime is 65642776391. The next prime is 65642776483. The reversal of 65642776399 is 99367724656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65642776399 - 2³ = 65642776391 is a prime.

It is a super-2 number, since 2×65642776399² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65642776399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65642776391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698327362 + ... + 698327455.

It is an arithmetic number, because the mean of its divisors is an integer number (16759857816).

Almost surely, 2^65642776399 is an apocalyptic number.

65642776399 is a deficient number, since it is larger than the sum of its proper divisors (1396654865).

65642776399 is a wasteful number, since it uses less digits than its factorization.

65642776399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396654864.

The product of its digits is 102876480, while the sum is 64.

The spelling of 65642776399 in words is "sixty-five billion, six hundred forty-two million, seven hundred seventy-six thousand, three hundred ninety-nine".