65991914 has 4 divisors (see below), whose sum is σ = 98987874. Its totient is φ = 32995956.

The previous prime is 65991869. The next prime is 65991917. The reversal of 65991914 is 41919956.

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

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 6932689 = 7685^2 + 2633^2 .

It is not an unprimeable number, because it can be changed into a prime (65991917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16497977 + ... + 16497980.

Almost surely, 2^65991914 is an apocalyptic number.

65991914 is a deficient number, since it is larger than the sum of its proper divisors (32995960).

65991914 is a wasteful number, since it uses less digits than its factorization.

65991914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32995959.

The product of its digits is 87480, while the sum is 44.

The square root of 65991914 is about 8123.5407304943. The cubic root of 65991914 is about 404.1074976171.

The spelling of 65991914 in words is "sixty-five million, nine hundred ninety-one thousand, nine hundred fourteen".