61323661 has 16 divisors (see below), whose sum is σ = 72835200. Its totient is φ = 50516928.

The previous prime is 61323653. The next prime is 61323677. The reversal of 61323661 is 16632316.

It is not a de Polignac number, because 61323661 - 2³ = 61323653 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 (61323061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54046 + ... + 55168.

It is an arithmetic number, because the mean of its divisors is an integer number (4552200).

Almost surely, 2^61323661 is an apocalyptic number.

It is an amenable number.

61323661 is a deficient number, since it is larger than the sum of its proper divisors (11511539).

61323661 is a wasteful number, since it uses less digits than its factorization.

61323661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428.

The product of its digits is 3888, while the sum is 28.

The square root of 61323661 is about 7830.9425358637. The cubic root of 61323661 is about 394.3447149370.

Adding to 61323661 its reverse (16632316), we get a palindrome (77955977).

The spelling of 61323661 in words is "sixty-one million, three hundred twenty-three thousand, six hundred sixty-one".