61564788561 has 8 divisors (see below), whose sum is σ = 82113768000. Its totient is φ = 41029500752.

The previous prime is 61564788553. The next prime is 61564788563. The reversal of 61564788561 is 16588746516.

61564788561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61564788561 - 2³ = 61564788553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61564788563) 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, 3412410 + ... + 3430403.

It is an arithmetic number, because the mean of its divisors is an integer number (10264221000).

Almost surely, 2^61564788561 is an apocalyptic number.

It is an amenable number.

61564788561 is a deficient number, since it is larger than the sum of its proper divisors (20548979439).

61564788561 is a wasteful number, since it uses less digits than its factorization.

61564788561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6845815.

The product of its digits is 9676800, while the sum is 57.

The spelling of 61564788561 in words is "sixty-one billion, five hundred sixty-four million, seven hundred eighty-eight thousand, five hundred sixty-one".