81632642294 has 16 divisors (see below), whose sum is σ = 141713088000. Its totient is φ = 34542564264.

The previous prime is 81632642279. The next prime is 81632642309. The reversal of 81632642294 is 49224623618.

It is an interprime number because it is at equal distance from previous prime (81632642279) and next prime (81632642309).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36903344 + ... + 36905555.

It is an arithmetic number, because the mean of its divisors is an integer number (8857068000).

Almost surely, 2^81632642294 is an apocalyptic number.

81632642294 is a deficient number, since it is larger than the sum of its proper divisors (60080445706).

81632642294 is a wasteful number, since it uses less digits than its factorization.

81632642294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73808987.

The product of its digits is 995328, while the sum is 47.

The spelling of 81632642294 in words is "eighty-one billion, six hundred thirty-two million, six hundred forty-two thousand, two hundred ninety-four".