61694874013 has 4 divisors (see below), whose sum is σ = 62330903740. Its totient is φ = 61058844288.

The previous prime is 61694873957. The next prime is 61694874019. The reversal of 61694874013 is 31047849616.

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 29083209444 + 32611664569 = 170538^2 + 180587^2 .

It is a cyclic number.

It is not a de Polignac number, because 61694874013 - 2²¹ = 61692776861 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 (61694874019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318014718 + ... + 318014911.

It is an arithmetic number, because the mean of its divisors is an integer number (15582725935).

Almost surely, 2^61694874013 is an apocalyptic number.

It is an amenable number.

61694874013 is a deficient number, since it is larger than the sum of its proper divisors (636029727).

61694874013 is an equidigital number, since it uses as much as digits as its factorization.

61694874013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636029726.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 61694874013 in words is "sixty-one billion, six hundred ninety-four million, eight hundred seventy-four thousand, thirteen".