64219948613 has 4 divisors (see below), whose sum is σ = 64688707500. Its totient is φ = 63751189728.

The previous prime is 64219948603. The next prime is 64219948621. The reversal of 64219948613 is 31684991246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47435968804 + 16783979809 = 217798^2 + 129553^2 .

It is a cyclic number.

It is not a de Polignac number, because 64219948613 - 2²⁶ = 64152839749 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 (64219948603) 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, 234379238 + ... + 234379511.

It is an arithmetic number, because the mean of its divisors is an integer number (16172176875).

Almost surely, 2^64219948613 is an apocalyptic number.

It is an amenable number.

64219948613 is a deficient number, since it is larger than the sum of its proper divisors (468758887).

64219948613 is a wasteful number, since it uses less digits than its factorization.

64219948613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468758886.

The product of its digits is 2239488, while the sum is 53.

The spelling of 64219948613 in words is "sixty-four billion, two hundred nineteen million, nine hundred forty-eight thousand, six hundred thirteen".