61606235641 has 4 divisors (see below), whose sum is σ = 61608147300. Its totient is φ = 61604323984.

The previous prime is 61606235623. The next prime is 61606235651. The reversal of 61606235641 is 14653260616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30034276416 + 31571959225 = 173304^2 + 177685^2 .

It is a cyclic number.

It is not a de Polignac number, because 61606235641 - 2¹⁷ = 61606104569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61606235594 and 61606235603.

It is not an unprimeable number, because it can be changed into a prime (61606235651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906646 + ... + 972223.

It is an arithmetic number, because the mean of its divisors is an integer number (15402036825).

Almost surely, 2^61606235641 is an apocalyptic number.

It is an amenable number.

61606235641 is a deficient number, since it is larger than the sum of its proper divisors (1911659).

61606235641 is a wasteful number, since it uses less digits than its factorization.

61606235641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911658.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 61606235641 in words is "sixty-one billion, six hundred six million, two hundred thirty-five thousand, six hundred forty-one".