36661997 has 4 divisors (see below), whose sum is σ = 36727680. Its totient is φ = 36596316.

The previous prime is 36661993. The next prime is 36662027. The reversal of 36661997 is 79916663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79916663 = 29 ⋅2755747.

It is a cyclic number.

It is not a de Polignac number, because 36661997 - 2² = 36661993 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 (36661991) 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, 31997 + ... + 33122.

It is an arithmetic number, because the mean of its divisors is an integer number (9181920).

Almost surely, 2^36661997 is an apocalyptic number.

It is an amenable number.

36661997 is a deficient number, since it is larger than the sum of its proper divisors (65683).

36661997 is an equidigital number, since it uses as much as digits as its factorization.

36661997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65682.

The product of its digits is 367416, while the sum is 47.

The square root of 36661997 is about 6054.9151108831. The cubic root of 36661997 is about 332.2043940269.

The spelling of 36661997 in words is "thirty-six million, six hundred sixty-one thousand, nine hundred ninety-seven".