81525509110 has 32 divisors (see below), whose sum is σ = 149885056800. Its totient is φ = 31917446400.

The previous prime is 81525509101. The next prime is 81525509129. The reversal of 81525509110 is 1190552518.

It is a self number, because there is not a number n which added to its sum of digits gives 81525509110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166591 + ... + 436810.

It is an arithmetic number, because the mean of its divisors is an integer number (4683908025).

Almost surely, 2^81525509110 is an apocalyptic number.

81525509110 is a deficient number, since it is larger than the sum of its proper divisors (68359547690).

81525509110 is a wasteful number, since it uses less digits than its factorization.

81525509110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603696.

The product of its (nonzero) digits is 18000, while the sum is 37.

The spelling of 81525509110 in words is "eighty-one billion, five hundred twenty-five million, five hundred nine thousand, one hundred ten".