61563679 has 4 divisors (see below), whose sum is σ = 61686576. Its totient is φ = 61440784.

The previous prime is 61563661. The next prime is 61563731. The reversal of 61563679 is 97636516.

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 61563679 - 2¹¹ = 61561631 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 (61563379) 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, 60694 + ... + 61699.

It is an arithmetic number, because the mean of its divisors is an integer number (15421644).

Almost surely, 2^61563679 is an apocalyptic number.

61563679 is a deficient number, since it is larger than the sum of its proper divisors (122897).

61563679 is a wasteful number, since it uses less digits than its factorization.

61563679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122896.

The product of its digits is 204120, while the sum is 43.

The square root of 61563679 is about 7846.2525450052. The cubic root of 61563679 is about 394.8585275559.

The spelling of 61563679 in words is "sixty-one million, five hundred sixty-three thousand, six hundred seventy-nine".