64994473650 has 24 divisors (see below), whose sum is σ = 161186295024. Its totient is φ = 17331859600.

The previous prime is 64994473637. The next prime is 64994473651. The reversal of 64994473650 is 5637449946.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64994473651) 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, 216648096 + ... + 216648395.

It is an arithmetic number, because the mean of its divisors is an integer number (6716095626).

Almost surely, 2^64994473650 is an apocalyptic number.

64994473650 is an abundant number, since it is smaller than the sum of its proper divisors (96191821374).

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

64994473650 is a wasteful number, since it uses less digits than its factorization.

64994473650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433296506 (or 433296501 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 64994473650 in words is "sixty-four billion, nine hundred ninety-four million, four hundred seventy-three thousand, six hundred fifty".