64621612645 has 8 divisors (see below), whose sum is σ = 77558554656. Its totient is φ = 51688877136.

The previous prime is 64621612631. The next prime is 64621612669. The reversal of 64621612645 is 54621612646.

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 64621612645 - 2¹¹ = 64621610597 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 7 ways as a sum of consecutive naturals, for example, 1017727 + ... + 1079356.

It is an arithmetic number, because the mean of its divisors is an integer number (9694819332).

Almost surely, 2^64621612645 is an apocalyptic number.

It is an amenable number.

64621612645 is a deficient number, since it is larger than the sum of its proper divisors (12936942011).

64621612645 is a wasteful number, since it uses less digits than its factorization.

64621612645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103251.

The product of its digits is 414720, while the sum is 43.

Subtracting from 64621612645 its reverse (54621612646), we obtain a palindrome (9999999999).

The spelling of 64621612645 in words is "sixty-four billion, six hundred twenty-one million, six hundred twelve thousand, six hundred forty-five".