81192777350 has 24 divisors (see below), whose sum is σ = 155890135488. Its totient is φ = 31429461600.

The previous prime is 81192777317. The next prime is 81192777353. The reversal of 81192777350 is 5377729118.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81192777353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26189669 + ... + 26192768.

It is an arithmetic number, because the mean of its divisors is an integer number (6495422312).

Almost surely, 2^81192777350 is an apocalyptic number.

81192777350 is a deficient number, since it is larger than the sum of its proper divisors (74697358138).

81192777350 is a wasteful number, since it uses less digits than its factorization.

81192777350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52382480 (or 52382475 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 50.

The spelling of 81192777350 in words is "eighty-one billion, one hundred ninety-two million, seven hundred seventy-seven thousand, three hundred fifty".