65991404 has 6 divisors (see below), whose sum is σ = 115484964. Its totient is φ = 32995700.

The previous prime is 65991403. The next prime is 65991407. The reversal of 65991404 is 40419956.

It is not an unprimeable number, because it can be changed into a prime (65991403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8248922 + ... + 8248929.

It is an arithmetic number, because the mean of its divisors is an integer number (19247494).

Almost surely, 2^65991404 is an apocalyptic number.

It is an amenable number.

65991404 is a deficient number, since it is larger than the sum of its proper divisors (49493560).

65991404 is a wasteful number, since it uses less digits than its factorization.

65991404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16497855 (or 16497853 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 65991404 is about 8123.5093401805. The cubic root of 65991404 is about 404.1064566039.

The spelling of 65991404 in words is "sixty-five million, nine hundred ninety-one thousand, four hundred four".