81437846071 has 8 divisors (see below), whose sum is σ = 83555175440. Its totient is φ = 79330672512.

The previous prime is 81437846059. The next prime is 81437846093. The reversal of 81437846071 is 17064873418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81437846071 - 2²³ = 81429457463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81437846011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2522706 + ... + 2554783.

It is an arithmetic number, because the mean of its divisors is an integer number (10444396930).

Almost surely, 2^81437846071 is an apocalyptic number.

81437846071 is a deficient number, since it is larger than the sum of its proper divisors (2117329369).

81437846071 is a wasteful number, since it uses less digits than its factorization.

81437846071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077905.

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 81437846071 in words is "eighty-one billion, four hundred thirty-seven million, eight hundred forty-six thousand, seventy-one".