64951395440 has 160 divisors (see below), whose sum is σ = 166073120640. Its totient is φ = 23522476032.

The previous prime is 64951395433. The next prime is 64951395499. The reversal of 64951395440 is 4459315946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4471229 + ... + 4485731.

It is an arithmetic number, because the mean of its divisors is an integer number (1037957004).

Almost surely, 2^64951395440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64951395440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83036560320).

64951395440 is an abundant number, since it is smaller than the sum of its proper divisors (101121725200).

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

64951395440 is a wasteful number, since it uses less digits than its factorization.

64951395440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14659 (or 14653 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 64951395440 in words is "sixty-four billion, nine hundred fifty-one million, three hundred ninety-five thousand, four hundred forty".