81433767371 has 8 divisors (see below), whose sum is σ = 88838943024. Its totient is φ = 74028942720.

The previous prime is 81433767367. The next prime is 81433767379. The reversal of 81433767371 is 17376733418.

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 81433767371 - 2² = 81433767367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81433767379) 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, 723431 + ... + 828383.

It is an arithmetic number, because the mean of its divisors is an integer number (11104867878).

Almost surely, 2^81433767371 is an apocalyptic number.

81433767371 is a deficient number, since it is larger than the sum of its proper divisors (7405175653).

81433767371 is a wasteful number, since it uses less digits than its factorization.

81433767371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175501.

The product of its digits is 1778112, while the sum is 50.

The spelling of 81433767371 in words is "eighty-one billion, four hundred thirty-three million, seven hundred sixty-seven thousand, three hundred seventy-one".