81104197634 has 4 divisors (see below), whose sum is σ = 121656296454. Its totient is φ = 40552098816.

The previous prime is 81104197597. The next prime is 81104197661. The reversal of 81104197634 is 43679140118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43679140118 = 2 ⋅21839570059.

It can be written as a sum of positive squares in only one way, i.e., 79889326609 + 1214871025 = 282647^2 + 34855^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20276049407 + ... + 20276049410.

Almost surely, 2^81104197634 is an apocalyptic number.

81104197634 is a deficient number, since it is larger than the sum of its proper divisors (40552098820).

81104197634 is a wasteful number, since it uses less digits than its factorization.

81104197634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40552098819.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 81104197634 in words is "eighty-one billion, one hundred four million, one hundred ninety-seven thousand, six hundred thirty-four".