81783334157 has 8 divisors (see below), whose sum is σ = 93617668800. Its totient is φ = 69986749824.

The previous prime is 81783334123. The next prime is 81783334169. The reversal of 81783334157 is 75143338718.

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 81783334157 - 2²⁴ = 81766556941 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 (81783334357) 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, 9432932 + ... + 9441597.

It is an arithmetic number, because the mean of its divisors is an integer number (11702208600).

Almost surely, 2^81783334157 is an apocalyptic number.

It is an amenable number.

81783334157 is a deficient number, since it is larger than the sum of its proper divisors (11834334643).

81783334157 is a wasteful number, since it uses less digits than its factorization.

81783334157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18875155.

The product of its digits is 1693440, while the sum is 50.

The spelling of 81783334157 in words is "eighty-one billion, seven hundred eighty-three million, three hundred thirty-four thousand, one hundred fifty-seven".