61561840288307 has 4 divisors (see below), whose sum is σ = 61624466779920. Its totient is φ = 61499213796696.

The previous prime is 61561840288261. The next prime is 61561840288321. The reversal of 61561840288307 is 70388204816516.

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 61561840288307 - 2³⁶ = 61493120811571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61561840288357) 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, 31313244332 + ... + 31313246297.

It is an arithmetic number, because the mean of its divisors is an integer number (15406116694980).

Almost surely, 2^{61561840288307} is an apocalyptic number.

61561840288307 is a deficient number, since it is larger than the sum of its proper divisors (62626491613).

61561840288307 is an equidigital number, since it uses as much as digits as its factorization.

61561840288307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62626491612.

The product of its (nonzero) digits is 15482880, while the sum is 59.

The spelling of 61561840288307 in words is "sixty-one trillion, five hundred sixty-one billion, eight hundred forty million, two hundred eighty-eight thousand, three hundred seven".