65917969 has 4 divisors (see below), whose sum is σ = 70988596. Its totient is φ = 60847344.

The previous prime is 65917949. The next prime is 65917981. The reversal of 65917969 is 96971956.

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 14250625 + 51667344 = 3775^2 + 7188^2 .

It is a cyclic number.

It is not a de Polignac number, because 65917969 - 2⁵ = 65917937 is a prime.

It is a super-2 number, since 2×65917969² = 8690357274169922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (65917909) 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, 2535294 + ... + 2535319.

It is an arithmetic number, because the mean of its divisors is an integer number (17747149).

Almost surely, 2^65917969 is an apocalyptic number.

65917969 is the 4688-th hex number.

It is an amenable number.

65917969 is a deficient number, since it is larger than the sum of its proper divisors (5070627).

65917969 is a wasteful number, since it uses less digits than its factorization.

65917969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070626.

The product of its digits is 918540, while the sum is 52.

The square root of 65917969 is about 8118.9881758751. The cubic root of 65917969 is about 403.9565048917.

The spelling of 65917969 in words is "sixty-five million, nine hundred seventeen thousand, nine hundred sixty-nine".