81877394750 has 16 divisors (see below), whose sum is σ = 153274483440. Its totient is φ = 32750957800.

The previous prime is 81877394747. The next prime is 81877394759. The reversal of 81877394750 is 5749377818.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81877394750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81877394759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163754540 + ... + 163755039.

It is an arithmetic number, because the mean of its divisors is an integer number (9579655215).

Almost surely, 2^81877394750 is an apocalyptic number.

81877394750 is a deficient number, since it is larger than the sum of its proper divisors (71397088690).

81877394750 is a wasteful number, since it uses less digits than its factorization.

81877394750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327509596 (or 327509586 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 59.

The spelling of 81877394750 in words is "eighty-one billion, eight hundred seventy-seven million, three hundred ninety-four thousand, seven hundred fifty".