64981922263 has 4 divisors (see below), whose sum is σ = 64987304328. Its totient is φ = 64976540200.

The previous prime is 64981922251. The next prime is 64981922273. The reversal of 64981922263 is 36222918946.

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 64981922263 - 2⁹ = 64981921751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64981922263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981922273) 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, 2672881 + ... + 2697082.

It is an arithmetic number, because the mean of its divisors is an integer number (16246826082).

Almost surely, 2^64981922263 is an apocalyptic number.

64981922263 is a deficient number, since it is larger than the sum of its proper divisors (5382065).

64981922263 is a wasteful number, since it uses less digits than its factorization.

64981922263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382064.

The product of its digits is 2239488, while the sum is 52.

The spelling of 64981922263 in words is "sixty-four billion, nine hundred eighty-one million, nine hundred twenty-two thousand, two hundred sixty-three".