64731120065 has 8 divisors (see below), whose sum is σ = 82246599720. Its totient is φ = 48738725632.

The previous prime is 64731120061. The next prime is 64731120071. The reversal of 64731120065 is 56002113746.

It can be written as a sum of positive squares in 4 ways, for example, as 36753874369 + 27977245696 = 191713^2 + 167264^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64731120065 - 2² = 64731120061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64731120061) 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, 380771210 + ... + 380771379.

It is an arithmetic number, because the mean of its divisors is an integer number (10280824965).

Almost surely, 2^64731120065 is an apocalyptic number.

It is an amenable number.

64731120065 is a deficient number, since it is larger than the sum of its proper divisors (17515479655).

64731120065 is a wasteful number, since it uses less digits than its factorization.

64731120065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761542611.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 64731120065 in words is "sixty-four billion, seven hundred thirty-one million, one hundred twenty thousand, sixty-five".