2645399864 has 8 divisors (see below), whose sum is σ = 4960124760. Its totient is φ = 1322699928.

The previous prime is 2645399857. The next prime is 2645399879. The reversal of 2645399864 is 4689935462.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165337484 + ... + 165337499.

It is an arithmetic number, because the mean of its divisors is an integer number (620015595).

Almost surely, 2^2645399864 is an apocalyptic number.

It is an amenable number.

2645399864 is a deficient number, since it is larger than the sum of its proper divisors (2314724896).

2645399864 is a wasteful number, since it uses less digits than its factorization.

2645399864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330674989 (or 330674985 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 56.

The square root of 2645399864 is about 51433.4508272583. The cubic root of 2645399864 is about 1383.0263109733.

The spelling of 2645399864 in words is "two billion, six hundred forty-five million, three hundred ninety-nine thousand, eight hundred sixty-four".