61663569 has 16 divisors (see below), whose sum is σ = 94414080. Its totient is φ = 35404560.

The previous prime is 61663543. The next prime is 61663583. The reversal of 61663569 is 96536616.

It is not a de Polignac number, because 61663569 - 2⁸ = 61663313 is a prime.

It is a super-2 number, since 2×61663569² = 7604791483635522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61663569.

It is not an unprimeable number, because it can be changed into a prime (61663169) 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, 48547 + ... + 49800.

It is an arithmetic number, because the mean of its divisors is an integer number (5900880).

Almost surely, 2^61663569 is an apocalyptic number.

It is an amenable number.

61663569 is a deficient number, since it is larger than the sum of its proper divisors (32750511).

61663569 is a wasteful number, since it uses less digits than its factorization.

61663569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98380.

The product of its digits is 174960, while the sum is 42.

The square root of 61663569 is about 7852.6154241756. The cubic root of 61663569 is about 395.0719710763.

The spelling of 61663569 in words is "sixty-one million, six hundred sixty-three thousand, five hundred sixty-nine".