64261266215 has 4 divisors (see below), whose sum is σ = 77113519464. Its totient is φ = 51409012968.

The previous prime is 64261266161. The next prime is 64261266229. The reversal of 64261266215 is 51266216246.

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 64261266215 - 2¹⁴ = 64261249831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6426126617 + ... + 6426126626.

It is an arithmetic number, because the mean of its divisors is an integer number (19278379866).

Almost surely, 2^64261266215 is an apocalyptic number.

64261266215 is a deficient number, since it is larger than the sum of its proper divisors (12852253249).

64261266215 is a wasteful number, since it uses less digits than its factorization.

64261266215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852253248.

The product of its digits is 207360, while the sum is 41.

The spelling of 64261266215 in words is "sixty-four billion, two hundred sixty-one million, two hundred sixty-six thousand, two hundred fifteen".