61663605 has 16 divisors (see below), whose sum is σ = 99852480. Its totient is φ = 32490368.

The previous prime is 61663603. The next prime is 61663627. The reversal of 61663605 is 50636616.

It is a cyclic number.

It is not a de Polignac number, because 61663605 - 2¹ = 61663603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61663603) 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, 23520 + ... + 26009.

It is an arithmetic number, because the mean of its divisors is an integer number (6240780).

Almost surely, 2^61663605 is an apocalyptic number.

It is an amenable number.

61663605 is a deficient number, since it is larger than the sum of its proper divisors (38188875).

61663605 is a wasteful number, since it uses less digits than its factorization.

61663605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49620.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 61663605 is about 7852.6177164051. The cubic root of 61663605 is about 395.0720479590.

The spelling of 61663605 in words is "sixty-one million, six hundred sixty-three thousand, six hundred five".