64981519699716 has 18 divisors (see below), whose sum is σ = 164258841463262. Its totient is φ = 21660506566560.

The previous prime is 64981519699687. The next prime is 64981519699799. The reversal of 64981519699716 is 61799691518946.

64981519699716 is a `hidden beast` number, since 6 + 4 + 9 + 8 + 1 + 519 + 6 + 9 + 97 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63842433101316 + 1139086598400 = 7990146^2 + 1067280^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 902521106905 + ... + 902521106976.

Almost surely, 2^{64981519699716} is an apocalyptic number.

It is an amenable number.

64981519699716 is an abundant number, since it is smaller than the sum of its proper divisors (99277321763546).

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

64981519699716 is a wasteful number, since it uses less digits than its factorization.

64981519699716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805042213891 (or 1805042213886 counting only the distinct ones).

The product of its digits is 1587237120, while the sum is 81.

The spelling of 64981519699716 in words is "sixty-four trillion, nine hundred eighty-one billion, five hundred nineteen million, six hundred ninety-nine thousand, seven hundred sixteen".