81142293290 has 16 divisors (see below), whose sum is σ = 146611479168. Its totient is φ = 32333505936.

The previous prime is 81142293229. The next prime is 81142293299. The reversal of 81142293290 is 9239224118.

It is not an unprimeable number, because it can be changed into a prime (81142293299) 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, 15423662 + ... + 15428921.

It is an arithmetic number, because the mean of its divisors is an integer number (9163217448).

Almost surely, 2^81142293290 is an apocalyptic number.

81142293290 is a deficient number, since it is larger than the sum of its proper divisors (65469185878).

81142293290 is a wasteful number, since it uses less digits than its factorization.

81142293290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30852853.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 81142293290 in words is "eighty-one billion, one hundred forty-two million, two hundred ninety-three thousand, two hundred ninety".