81103517352 has 160 divisors (see below), whose sum is σ = 266879400480. Its totient is φ = 22686272640.

The previous prime is 81103517347. The next prime is 81103517357. The reversal of 81103517352 is 25371530118.

It is a happy number.

81103517352 is a `hidden beast` number, since 8 + 1 + 103 + 517 + 35 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (81103517347) and next prime (81103517357).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81103517357) 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 39 ways as a sum of consecutive naturals, for example, 344958 + ... + 530285.

It is an arithmetic number, because the mean of its divisors is an integer number (1667996253).

Almost surely, 2^81103517352 is an apocalyptic number.

It is an amenable number.

81103517352 is an abundant number, since it is smaller than the sum of its proper divisors (185775883128).

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

81103517352 is a wasteful number, since it uses less digits than its factorization.

81103517352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875285 (or 875272 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 81103517352 in words is "eighty-one billion, one hundred three million, five hundred seventeen thousand, three hundred fifty-two".