64261290653 has 4 divisors (see below), whose sum is σ = 73441475040. Its totient is φ = 55081106268.

The previous prime is 64261290637. The next prime is 64261290659. The reversal of 64261290653 is 35609216246.

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, and also an emirpimes, since its reverse is a distinct semiprime: 35609216246 = 2 ⋅17804608123.

It is a cyclic number.

It is not a de Polignac number, because 64261290653 - 2⁴ = 64261290637 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 (64261290659) 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, 4590092183 + ... + 4590092196.

It is an arithmetic number, because the mean of its divisors is an integer number (18360368760).

Almost surely, 2^64261290653 is an apocalyptic number.

It is an amenable number.

64261290653 is a deficient number, since it is larger than the sum of its proper divisors (9180184387).

64261290653 is an equidigital number, since it uses as much as digits as its factorization.

64261290653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9180184386.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 64261290653 in words is "sixty-four billion, two hundred sixty-one million, two hundred ninety thousand, six hundred fifty-three".