81761133358 has 16 divisors (see below), whose sum is σ = 125609425920. Its totient is φ = 39893076216.

The previous prime is 81761133331. The next prime is 81761133367. The reversal of 81761133358 is 85333116718.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 343828 + ... + 530791.

It is an arithmetic number, because the mean of its divisors is an integer number (7850589120).

Almost surely, 2^81761133358 is an apocalyptic number.

81761133358 is a deficient number, since it is larger than the sum of its proper divisors (43848292562).

81761133358 is a wasteful number, since it uses less digits than its factorization.

81761133358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875751.

The product of its digits is 362880, while the sum is 46.

The spelling of 81761133358 in words is "eighty-one billion, seven hundred sixty-one million, one hundred thirty-three thousand, three hundred fifty-eight".