64426638346 has 24 divisors (see below), whose sum is σ = 113412778020. Its totient is φ = 27367062912.

The previous prime is 64426638317. The next prime is 64426638349. The reversal of 64426638346 is 64383662446.

It can be written as a sum of positive squares in 2 ways, for example, as 44462361321 + 19964277025 = 210861^2 + 141295^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64426638293 and 64426638302.

It is not an unprimeable number, because it can be changed into a prime (64426638349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2897841 + ... + 2919988.

Almost surely, 2^64426638346 is an apocalyptic number.

64426638346 is a deficient number, since it is larger than the sum of its proper divisors (48986139674).

64426638346 is a wasteful number, since it uses less digits than its factorization.

64426638346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817958 (or 5817951 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 52.

The spelling of 64426638346 in words is "sixty-four billion, four hundred twenty-six million, six hundred thirty-eight thousand, three hundred forty-six".