65901649 has 4 divisors (see below), whose sum is σ = 71892720. Its totient is φ = 59910580.

The previous prime is 65901623. The next prime is 65901679. The reversal of 65901649 is 94610956.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65901649 - 2¹⁷ = 65770577 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65901679) 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, 2995519 + ... + 2995540.

It is an arithmetic number, because the mean of its divisors is an integer number (17973180).

Almost surely, 2^65901649 is an apocalyptic number.

It is an amenable number.

65901649 is a deficient number, since it is larger than the sum of its proper divisors (5991071).

65901649 is a wasteful number, since it uses less digits than its factorization.

65901649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991070.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 65901649 is about 8117.9830623130. The cubic root of 65901649 is about 403.9231648965.

The spelling of 65901649 in words is "sixty-five million, nine hundred one thousand, six hundred forty-nine".