64448721649356 has 48 divisors (see below), whose sum is σ = 164051880988800. Its totient is φ = 19529845470720.

The previous prime is 64448721649283. The next prime is 64448721649369. The reversal of 64448721649356 is 65394612784446.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45080235 + ... + 46487901.

It is an arithmetic number, because the mean of its divisors is an integer number (3417747520600).

Almost surely, 2^{64448721649356} is an apocalyptic number.

64448721649356 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

64448721649356 is an abundant number, since it is smaller than the sum of its proper divisors (99603159339444).

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

64448721649356 is a wasteful number, since it uses less digits than its factorization.

64448721649356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754534 (or 1754532 counting only the distinct ones).

The product of its digits is 836075520, while the sum is 69.

The spelling of 64448721649356 in words is "sixty-four trillion, four hundred forty-eight billion, seven hundred twenty-one million, six hundred forty-nine thousand, three hundred fifty-six".