5061561661 has 24 divisors (see below), whose sum is σ = 5683797000. Its totient is φ = 4500018432.

The previous prime is 5061561619. The next prime is 5061561667. The reversal of 5061561661 is 1661651605.

It can be written as a sum of positive squares in 12 ways, for example, as 318622500 + 4742939161 = 17850^2 + 68869^2 .

It is not a de Polignac number, because 5061561661 - 2⁹ = 5061561149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5061561661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5061561667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2493595 + ... + 2495623.

It is an arithmetic number, because the mean of its divisors is an integer number (236824875).

Almost surely, 2^5061561661 is an apocalyptic number.

It is an amenable number.

5061561661 is a deficient number, since it is larger than the sum of its proper divisors (622235339).

5061561661 is a wasteful number, since it uses less digits than its factorization.

5061561661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 5061561661 is about 71144.6530738607. The cubic root of 5061561661 is about 1716.9652703596.

The spelling of 5061561661 in words is "five billion, sixty-one million, five hundred sixty-one thousand, six hundred sixty-one".