81527744910 has 32 divisors (see below), whose sum is σ = 195840904320. Its totient is φ = 21721363488.

The previous prime is 81527744897. The next prime is 81527744911. The reversal of 81527744910 is 1944772518.

It is a super-2 number, since 2×81527744910² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81527744910.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81527744911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176280 + ... + 1243659.

It is an arithmetic number, because the mean of its divisors is an integer number (6120028260).

Almost surely, 2^81527744910 is an apocalyptic number.

81527744910 is an abundant number, since it is smaller than the sum of its proper divisors (114313159410).

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

81527744910 is a wasteful number, since it uses less digits than its factorization.

81527744910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421072.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 81527744910 in words is "eighty-one billion, five hundred twenty-seven million, seven hundred forty-four thousand, nine hundred ten".