64765337261 has 4 divisors (see below), whose sum is σ = 64905826524. Its totient is φ = 64624848000.

The previous prime is 64765337243. The next prime is 64765337269. The reversal of 64765337261 is 16273356746.

64765337261 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 can be written as a sum of positive squares in 2 ways, for example, as 49342181161 + 15423156100 = 222131^2 + 124190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64765337261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64765337269) 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, 70243940 + ... + 70244861.

It is an arithmetic number, because the mean of its divisors is an integer number (16226456631).

Almost surely, 2^64765337261 is an apocalyptic number.

It is an amenable number.

64765337261 is a deficient number, since it is larger than the sum of its proper divisors (140489263).

64765337261 is a wasteful number, since it uses less digits than its factorization.

64765337261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140489262.

The product of its digits is 3810240, while the sum is 50.

The spelling of 64765337261 in words is "sixty-four billion, seven hundred sixty-five million, three hundred thirty-seven thousand, two hundred sixty-one".