61563659 has 4 divisors (see below), whose sum is σ = 62995416. Its totient is φ = 60131904.

The previous prime is 61563653. The next prime is 61563661. The reversal of 61563659 is 95636516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61563659 - 2¹⁶ = 61498123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61563653) 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, 715814 + ... + 715899.

It is an arithmetic number, because the mean of its divisors is an integer number (15748854).

Almost surely, 2^61563659 is an apocalyptic number.

61563659 is a deficient number, since it is larger than the sum of its proper divisors (1431757).

61563659 is a wasteful number, since it uses less digits than its factorization.

61563659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431756.

The product of its digits is 145800, while the sum is 41.

The square root of 61563659 is about 7846.2512705113. The cubic root of 61563659 is about 394.8584847970.

The spelling of 61563659 in words is "sixty-one million, five hundred sixty-three thousand, six hundred fifty-nine".