61665161 has 4 divisors (see below), whose sum is σ = 61680912. Its totient is φ = 61649412.

The previous prime is 61665113. The next prime is 61665167. The reversal of 61665161 is 16156616.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61665161 - 2²² = 57470857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61665167) 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, 3050 + ... + 11516.

It is an arithmetic number, because the mean of its divisors is an integer number (15420228).

Almost surely, 2^61665161 is an apocalyptic number.

It is an amenable number.

61665161 is a deficient number, since it is larger than the sum of its proper divisors (15751).

61665161 is an equidigital number, since it uses as much as digits as its factorization.

61665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15750.

The product of its digits is 6480, while the sum is 32.

The square root of 61665161 is about 7852.7167910221. The cubic root of 61665161 is about 395.0753709723.

The spelling of 61665161 in words is "sixty-one million, six hundred sixty-five thousand, one hundred sixty-one".