61165601 has 4 divisors (see below), whose sum is σ = 69903552. Its totient is φ = 52427652.

The previous prime is 61165591. The next prime is 61165607. The reversal of 61165601 is 10656116.

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.

It is a cyclic number.

It is not a de Polignac number, because 61165601 - 2¹⁸ = 60903457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61165607) 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, 4368965 + ... + 4368978.

It is an arithmetic number, because the mean of its divisors is an integer number (17475888).

Almost surely, 2^61165601 is an apocalyptic number.

It is an amenable number.

61165601 is a deficient number, since it is larger than the sum of its proper divisors (8737951).

61165601 is an equidigital number, since it uses as much as digits as its factorization.

61165601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8737950.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 61165601 is about 7820.8440081618. The cubic root of 61165601 is about 394.0056193209.

The spelling of 61165601 in words is "sixty-one million, one hundred sixty-five thousand, six hundred one".