81128474061 has 16 divisors (see below), whose sum is σ = 108876905088. Its totient is φ = 53732952000.

The previous prime is 81128474059. The next prime is 81128474069. The reversal of 81128474061 is 16047482118.

It is not a de Polignac number, because 81128474061 - 2¹ = 81128474059 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81128474069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5829211 + ... + 5843111.

It is an arithmetic number, because the mean of its divisors is an integer number (6804806568).

Almost surely, 2^81128474061 is an apocalyptic number.

It is an amenable number.

81128474061 is a deficient number, since it is larger than the sum of its proper divisors (27748431027).

81128474061 is a wasteful number, since it uses less digits than its factorization.

81128474061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26452.

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 81128474061 in words is "eighty-one billion, one hundred twenty-eight million, four hundred seventy-four thousand, sixty-one".