61205801899 has 8 divisors (see below), whose sum is σ = 66946144320. Its totient is φ = 55494822600.

The previous prime is 61205801869. The next prime is 61205801927. The reversal of 61205801899 is 99810850216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61205801899 - 2⁷ = 61205801771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61205801849) 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 7 ways as a sum of consecutive naturals, for example, 7336417 + ... + 7344754.

It is an arithmetic number, because the mean of its divisors is an integer number (8368268040).

Almost surely, 2^61205801899 is an apocalyptic number.

61205801899 is a deficient number, since it is larger than the sum of its proper divisors (5740342421).

61205801899 is a wasteful number, since it uses less digits than its factorization.

61205801899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14681561.

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 61205801899 in words is "sixty-one billion, two hundred five million, eight hundred one thousand, eight hundred ninety-nine".