61818396793 has 4 divisors (see below), whose sum is σ = 61819141120. Its totient is φ = 61817652468.

The previous prime is 61818396767. The next prime is 61818396803. The reversal of 61818396793 is 39769381816.

61818396793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61818396793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61818306793) 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, 229305 + ... + 419782.

It is an arithmetic number, because the mean of its divisors is an integer number (15454785280).

Almost surely, 2^61818396793 is an apocalyptic number.

It is an amenable number.

61818396793 is a deficient number, since it is larger than the sum of its proper divisors (744327).

61818396793 is an equidigital number, since it uses as much as digits as its factorization.

61818396793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744326.

The product of its digits is 11757312, while the sum is 61.

The spelling of 61818396793 in words is "sixty-one billion, eight hundred eighteen million, three hundred ninety-six thousand, seven hundred ninety-three".