61663823 has 8 divisors (see below), whose sum is σ = 66544800. Its totient is φ = 56802528.

The previous prime is 61663813. The next prime is 61663829. The reversal of 61663823 is 32836616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61663823 - 2¹⁶ = 61598287 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 (61663829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1958 + ... + 11276.

It is an arithmetic number, because the mean of its divisors is an integer number (8318100).

Almost surely, 2^61663823 is an apocalyptic number.

61663823 is a deficient number, since it is larger than the sum of its proper divisors (4880977).

61663823 is a wasteful number, since it uses less digits than its factorization.

61663823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9841.

The product of its digits is 31104, while the sum is 35.

The square root of 61663823 is about 7852.6315971144. The cubic root of 61663823 is about 395.0725135259.

The spelling of 61663823 in words is "sixty-one million, six hundred sixty-three thousand, eight hundred twenty-three".