61561510601 has 4 divisors (see below), whose sum is σ = 62303215632. Its totient is φ = 60819805572.

The previous prime is 61561510597. The next prime is 61561510613. The reversal of 61561510601 is 10601516516.

61561510601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61561510601 - 2² = 61561510597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61560510601) 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, 370852391 + ... + 370852556.

It is an arithmetic number, because the mean of its divisors is an integer number (15575803908).

Almost surely, 2^61561510601 is an apocalyptic number.

It is an amenable number.

61561510601 is a deficient number, since it is larger than the sum of its proper divisors (741705031).

61561510601 is an equidigital number, since it uses as much as digits as its factorization.

61561510601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741705030.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 61561510601 in words is "sixty-one billion, five hundred sixty-one million, five hundred ten thousand, six hundred one".