64507372261 has 4 divisors (see below), whose sum is σ = 64511564832. Its totient is φ = 64503179692.

The previous prime is 64507372231. The next prime is 64507372277. The reversal of 64507372261 is 16227370546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64507372261 is a prime.

It is a super-2 number, since 2×64507372261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64507372231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073121 + ... + 2104006.

It is an arithmetic number, because the mean of its divisors is an integer number (16127891208).

Almost surely, 2^64507372261 is an apocalyptic number.

It is an amenable number.

64507372261 is a deficient number, since it is larger than the sum of its proper divisors (4192571).

64507372261 is a wasteful number, since it uses less digits than its factorization.

64507372261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192570.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 64507372261 in words is "sixty-four billion, five hundred seven million, three hundred seventy-two thousand, two hundred sixty-one".