65612776643 has 4 divisors (see below), whose sum is σ = 65620606320. Its totient is φ = 65604946968.

The previous prime is 65612776613. The next prime is 65612776651. The reversal of 65612776643 is 34667721656.

65612776643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65612776643 - 2¹⁴ = 65612760259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65612776613) 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, 3902255 + ... + 3919032.

It is an arithmetic number, because the mean of its divisors is an integer number (16405151580).

Almost surely, 2^65612776643 is an apocalyptic number.

65612776643 is a deficient number, since it is larger than the sum of its proper divisors (7829677).

65612776643 is an equidigital number, since it uses as much as digits as its factorization.

65612776643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7829676.

The product of its digits is 7620480, while the sum is 53.

The spelling of 65612776643 in words is "sixty-five billion, six hundred twelve million, seven hundred seventy-six thousand, six hundred forty-three".