61805668490 has 32 divisors (see below), whose sum is σ = 112336994880. Its totient is φ = 24480952704.

The previous prime is 61805668487. The next prime is 61805668511. The reversal of 61805668490 is 9486650816.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2860046 + ... + 2881574.

It is an arithmetic number, because the mean of its divisors is an integer number (3510531090).

Almost surely, 2^61805668490 is an apocalyptic number.

61805668490 is a deficient number, since it is larger than the sum of its proper divisors (50531326390).

61805668490 is a wasteful number, since it uses less digits than its factorization.

61805668490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24326.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 61805668490 in words is "sixty-one billion, eight hundred five million, six hundred sixty-eight thousand, four hundred ninety".