61382345261 has 4 divisors (see below), whose sum is σ = 61387145724. Its totient is φ = 61377544800.

The previous prime is 61382345257. The next prime is 61382345263. The reversal of 61382345261 is 16254328316.

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 15583777225 + 45798568036 = 124835^2 + 214006^2 .

It is a cyclic number.

It is not a de Polignac number, because 61382345261 - 2² = 61382345257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61382345263) 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, 2381000 + ... + 2406641.

It is an arithmetic number, because the mean of its divisors is an integer number (15346786431).

Almost surely, 2^61382345261 is an apocalyptic number.

It is an amenable number.

61382345261 is a deficient number, since it is larger than the sum of its proper divisors (4800463).

61382345261 is a wasteful number, since it uses less digits than its factorization.

61382345261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800462.

The product of its digits is 207360, while the sum is 41.

The spelling of 61382345261 in words is "sixty-one billion, three hundred eighty-two million, three hundred forty-five thousand, two hundred sixty-one".