64609133946 has 128 divisors (see below), whose sum is σ = 159556608000. Its totient is φ = 17385278400.

The previous prime is 64609133923. The next prime is 64609133951. The reversal of 64609133946 is 64933190646.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6759871 + ... + 6769421.

It is an arithmetic number, because the mean of its divisors is an integer number (1246536000).

Almost surely, 2^64609133946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64609133946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79778304000).

64609133946 is an abundant number, since it is smaller than the sum of its proper divisors (94947474054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64609133946 is a wasteful number, since it uses less digits than its factorization.

64609133946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9769 (or 9755 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 51.

The spelling of 64609133946 in words is "sixty-four billion, six hundred nine million, one hundred thirty-three thousand, nine hundred forty-six".