61744362613 has 4 divisors (see below), whose sum is σ = 61754469228. Its totient is φ = 61734256000.

The previous prime is 61744362611. The next prime is 61744362619. The reversal of 61744362613 is 31626344716.

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 45395415844 + 16348946769 = 213062^2 + 127863^2 .

It is a cyclic number.

It is not a de Polignac number, because 61744362613 - 2¹ = 61744362611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61744362613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61744362611) 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, 5044138 + ... + 5056363.

It is an arithmetic number, because the mean of its divisors is an integer number (15438617307).

Almost surely, 2^61744362613 is an apocalyptic number.

It is an amenable number.

61744362613 is a deficient number, since it is larger than the sum of its proper divisors (10106615).

61744362613 is a wasteful number, since it uses less digits than its factorization.

61744362613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106614.

The product of its digits is 435456, while the sum is 43.

The spelling of 61744362613 in words is "sixty-one billion, seven hundred forty-four million, three hundred sixty-two thousand, six hundred thirteen".