64279996225 has 9 divisors (see below), whose sum is σ = 79708767267. Its totient is φ = 51422982840.

The previous prime is 64279996223. The next prime is 64279996247. The reversal of 64279996225 is 52269997246.

The square root of 64279996225 is 253535.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 23140798641 + 41139197584 = 152121^2 + 202828^2 .

It is not a de Polignac number, because 64279996225 - 2¹ = 64279996223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64279996223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1242322 + ... + 1293028.

Almost surely, 2^64279996225 is an apocalyptic number.

64279996225 is the 253535-th square number.

64279996225 is the 126768-th centered octagonal number.

It is an amenable number.

64279996225 is a deficient number, since it is larger than the sum of its proper divisors (15428771042).

64279996225 is an frugal number, since it uses more digits than its factorization.

64279996225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101424 (or 50712 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 61.

The spelling of 64279996225 in words is "sixty-four billion, two hundred seventy-nine million, nine hundred ninety-six thousand, two hundred twenty-five".