65722191 has 4 divisors (see below), whose sum is σ = 87629592. Its totient is φ = 43814792.

The previous prime is 65722169. The next prime is 65722199. The reversal of 65722191 is 19122756.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65722191 - 2¹⁴ = 65705807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65722199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10953696 + ... + 10953701.

It is an arithmetic number, because the mean of its divisors is an integer number (21907398).

Almost surely, 2^65722191 is an apocalyptic number.

65722191 is a deficient number, since it is larger than the sum of its proper divisors (21907401).

65722191 is a wasteful number, since it uses less digits than its factorization.

65722191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21907400.

The product of its digits is 7560, while the sum is 33.

The square root of 65722191 is about 8106.9224123585. The cubic root of 65722191 is about 403.5561880390.

The spelling of 65722191 in words is "sixty-five million, seven hundred twenty-two thousand, one hundred ninety-one".