65916749 has 4 divisors (see below), whose sum is σ = 66103836. Its totient is φ = 65729664.

The previous prime is 65916743. The next prime is 65916751. The reversal of 65916749 is 94761956.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41344900 + 24571849 = 6430^2 + 4957^2 .

It is a cyclic number.

It is not a de Polignac number, because 65916749 - 2⁴ = 65916733 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 (65916743) 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, 93014 + ... + 93719.

It is an arithmetic number, because the mean of its divisors is an integer number (16525959).

Almost surely, 2^65916749 is an apocalyptic number.

It is an amenable number.

65916749 is a deficient number, since it is larger than the sum of its proper divisors (187087).

65916749 is a wasteful number, since it uses less digits than its factorization.

65916749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187086.

The product of its digits is 408240, while the sum is 47.

The square root of 65916749 is about 8118.9130430126. The cubic root of 65916749 is about 403.9540127539.

The spelling of 65916749 in words is "sixty-five million, nine hundred sixteen thousand, seven hundred forty-nine".