64922091639 has 16 divisors (see below), whose sum is σ = 91677634560. Its totient is φ = 40725244800.

The previous prime is 64922091623. The next prime is 64922091659. The reversal of 64922091639 is 93619022946.

64922091639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64922091639 - 2⁴ = 64922091623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 64922091591 and 64922091600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64922091659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49482 + ... + 363720.

It is an arithmetic number, because the mean of its divisors is an integer number (5729852160).

Almost surely, 2^64922091639 is an apocalyptic number.

64922091639 is a deficient number, since it is larger than the sum of its proper divisors (26755542921).

64922091639 is a wasteful number, since it uses less digits than its factorization.

64922091639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318310.

The product of its (nonzero) digits is 1259712, while the sum is 51.

The spelling of 64922091639 in words is "sixty-four billion, nine hundred twenty-two million, ninety-one thousand, six hundred thirty-nine".