81649875270 has 16 divisors (see below), whose sum is σ = 195959700720. Its totient is φ = 21773300064.

The previous prime is 81649875257. The next prime is 81649875337. The reversal of 81649875270 is 7257894618.

It is a self number, because there is not a number n which added to its sum of digits gives 81649875270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360831225 + ... + 1360831284.

It is an arithmetic number, because the mean of its divisors is an integer number (12247481295).

Almost surely, 2^81649875270 is an apocalyptic number.

81649875270 is an abundant number, since it is smaller than the sum of its proper divisors (114309825450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81649875270 is a wasteful number, since it uses less digits than its factorization.

81649875270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721662519.

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 81649875270 in words is "eighty-one billion, six hundred forty-nine million, eight hundred seventy-five thousand, two hundred seventy".