65642791 has 8 divisors (see below), whose sum is σ = 66648960. Its totient is φ = 64641912.

The previous prime is 65642789. The next prime is 65642803. The reversal of 65642791 is 19724656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65642791 - 2¹ = 65642789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65642711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28696 + ... + 30898.

It is an arithmetic number, because the mean of its divisors is an integer number (8331120).

Almost surely, 2^65642791 is an apocalyptic number.

65642791 is a deficient number, since it is larger than the sum of its proper divisors (1006169).

65642791 is a wasteful number, since it uses less digits than its factorization.

65642791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645.

The product of its digits is 90720, while the sum is 40.

The square root of 65642791 is about 8102.0238829567. The cubic root of 65642791 is about 403.3936083830.

The spelling of 65642791 in words is "sixty-five million, six hundred forty-two thousand, seven hundred ninety-one".