64065431544 has 32 divisors (see below), whose sum is σ = 165330147840. Its totient is φ = 20666268000.

The previous prime is 64065431539. The next prime is 64065431569. The reversal of 64065431544 is 44513456046.

It is a junction number, because it is equal to n+sod(n) for n = 64065431496 and 64065431505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43053982 + ... + 43055469.

It is an arithmetic number, because the mean of its divisors is an integer number (5166567120).

Almost surely, 2^64065431544 is an apocalyptic number.

It is an amenable number.

64065431544 is an abundant number, since it is smaller than the sum of its proper divisors (101264716296).

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

64065431544 is a wasteful number, since it uses less digits than its factorization.

64065431544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86109491 (or 86109487 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 64065431544 in words is "sixty-four billion, sixty-five million, four hundred thirty-one thousand, five hundred forty-four".