81538850077 has 8 divisors (see below), whose sum is σ = 82847629440. Its totient is φ = 80235254880.

The previous prime is 81538850059. The next prime is 81538850083. The reversal of 81538850077 is 77005883518.

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 81538850077 - 2²³ = 81530461469 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 (81538850027) 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, 1264327 + ... + 1327252.

It is an arithmetic number, because the mean of its divisors is an integer number (10355953680).

Almost surely, 2^81538850077 is an apocalyptic number.

It is an amenable number.

81538850077 is a deficient number, since it is larger than the sum of its proper divisors (1308779363).

81538850077 is a wasteful number, since it uses less digits than its factorization.

81538850077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592083.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 81538850077 in words is "eighty-one billion, five hundred thirty-eight million, eight hundred fifty thousand, seventy-seven".