64662253261 has 4 divisors (see below), whose sum is σ = 64678394592. Its totient is φ = 64646111932.

The previous prime is 64662253237. The next prime is 64662253273. The reversal of 64662253261 is 16235226646.

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 not a de Polignac number, because 64662253261 - 2⁹ = 64662252749 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 (64662223261) 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, 8064655 + ... + 8072668.

It is an arithmetic number, because the mean of its divisors is an integer number (16169598648).

Almost surely, 2^64662253261 is an apocalyptic number.

It is an amenable number.

64662253261 is a deficient number, since it is larger than the sum of its proper divisors (16141331).

64662253261 is a wasteful number, since it uses less digits than its factorization.

64662253261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16141330.

The product of its digits is 622080, while the sum is 43.

The spelling of 64662253261 in words is "sixty-four billion, six hundred sixty-two million, two hundred fifty-three thousand, two hundred sixty-one".