36665991 has 24 divisors (see below), whose sum is σ = 59033520. Its totient is φ = 21793536.

The previous prime is 36665977. The next prime is 36666017. The reversal of 36665991 is 19956663.

It is not a de Polignac number, because 36665991 - 2⁹ = 36665479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36665911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3400 + ... + 9213.

It is an arithmetic number, because the mean of its divisors is an integer number (2459730).

Almost surely, 2^36665991 is an apocalyptic number.

36665991 is a deficient number, since it is larger than the sum of its proper divisors (22367529).

36665991 is a wasteful number, since it uses less digits than its factorization.

36665991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12655 (or 12652 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 36665991 is about 6055.2449165992. The cubic root of 36665991 is about 332.2164571647.

The spelling of 36665991 in words is "thirty-six million, six hundred sixty-five thousand, nine hundred ninety-one".