61111081799 has 4 divisors (see below), whose sum is σ = 61171054440. Its totient is φ = 61051109160.

The previous prime is 61111081771. The next prime is 61111081853. The reversal of 61111081799 is 99718011116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61111081799 - 2⁸ = 61111081543 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 (61111071799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29984792 + ... + 29986829.

It is an arithmetic number, because the mean of its divisors is an integer number (15292763610).

Almost surely, 2^61111081799 is an apocalyptic number.

61111081799 is a deficient number, since it is larger than the sum of its proper divisors (59972641).

61111081799 is a wasteful number, since it uses less digits than its factorization.

61111081799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59972640.

The product of its (nonzero) digits is 27216, while the sum is 44.

The spelling of 61111081799 in words is "sixty-one billion, one hundred eleven million, eighty-one thousand, seven hundred ninety-nine".