64544510545 has 24 divisors (see below), whose sum is σ = 79022882304. Its totient is φ = 50609408928.

The previous prime is 64544510483. The next prime is 64544510551. The reversal of 64544510545 is 54501544546.

It is a de Polignac number, because none of the positive numbers 2^k-64544510545 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6034192 + ... + 6044878.

It is an arithmetic number, because the mean of its divisors is an integer number (3292620096).

Almost surely, 2^64544510545 is an apocalyptic number.

It is an amenable number.

64544510545 is a deficient number, since it is larger than the sum of its proper divisors (14478371759).

64544510545 is a wasteful number, since it uses less digits than its factorization.

64544510545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11157 (or 11098 counting only the distinct ones).

The product of its (nonzero) digits is 960000, while the sum is 43.

The spelling of 64544510545 in words is "sixty-four billion, five hundred forty-four million, five hundred ten thousand, five hundred forty-five".