65722251 has 16 divisors (see below), whose sum is σ = 100390400. Its totient is φ = 37464768.

The previous prime is 65722231. The next prime is 65722259. The reversal of 65722251 is 15222756.

It is not a de Polignac number, because 65722251 - 2⁵ = 65722219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65722259) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 5655 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (6274400).

Almost surely, 2^65722251 is an apocalyptic number.

65722251 is a deficient number, since it is larger than the sum of its proper divisors (34668149).

65722251 is a wasteful number, since it uses less digits than its factorization.

65722251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7578.

The product of its digits is 8400, while the sum is 30.

The square root of 65722251 is about 8106.9261128988. The cubic root of 65722251 is about 403.5563108456.

The spelling of 65722251 in words is "sixty-five million, seven hundred twenty-two thousand, two hundred fifty-one".