64440921946 has 8 divisors (see below), whose sum is σ = 96672520800. Its totient is φ = 32216748348.

The previous prime is 64440921931. The next prime is 64440921997. The reversal of 64440921946 is 64912904446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64440921946.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834566 + ... + 1869361.

It is an arithmetic number, because the mean of its divisors is an integer number (12084065100).

Almost surely, 2^64440921946 is an apocalyptic number.

64440921946 is a deficient number, since it is larger than the sum of its proper divisors (32231598854).

64440921946 is a wasteful number, since it uses less digits than its factorization.

64440921946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712628.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 64440921946 in words is "sixty-four billion, four hundred forty million, nine hundred twenty-one thousand, nine hundred forty-six".