64642446245 has 16 divisors (see below), whose sum is σ = 83548426752. Its totient is φ = 47729962560.

The previous prime is 64642446233. The next prime is 64642446287. The reversal of 64642446245 is 54264424646.

It is not a de Polignac number, because 64642446245 - 2²² = 64638251941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64642446245.

It is a congruent number.

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, 497090 + ... + 613500.

It is an arithmetic number, because the mean of its divisors is an integer number (5221776672).

Almost surely, 2^64642446245 is an apocalyptic number.

64642446245 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64642446245 is a deficient number, since it is larger than the sum of its proper divisors (18905980507).

64642446245 is a wasteful number, since it uses less digits than its factorization.

64642446245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124972.

The product of its digits is 4423680, while the sum is 47.

The spelling of 64642446245 in words is "sixty-four billion, six hundred forty-two million, four hundred forty-six thousand, two hundred forty-five".