61994594813 has 4 divisors (see below), whose sum is σ = 63010899708. Its totient is φ = 60978289920.

The previous prime is 61994594803. The next prime is 61994594843. The reversal of 61994594813 is 31849549916.

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 2039154649 + 59955440164 = 45157^2 + 244858^2 .

It is a cyclic number.

It is not a de Polignac number, because 61994594813 - 2³⁴ = 44814725629 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 (61994594803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508152356 + ... + 508152477.

It is an arithmetic number, because the mean of its divisors is an integer number (15752724927).

Almost surely, 2^61994594813 is an apocalyptic number.

It is an amenable number.

61994594813 is a deficient number, since it is larger than the sum of its proper divisors (1016304895).

61994594813 is a wasteful number, since it uses less digits than its factorization.

61994594813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016304894.

The product of its digits is 8398080, while the sum is 59.

The spelling of 61994594813 in words is "sixty-one billion, nine hundred ninety-four million, five hundred ninety-four thousand, eight hundred thirteen".