81541217750 has 16 divisors (see below), whose sum is σ = 152645160096. Its totient is φ = 32616487000.

The previous prime is 81541217717. The next prime is 81541217773. The reversal of 81541217750 is 5771214518.

It is a junction number, because it is equal to n+sod(n) for n = 81541217698 and 81541217707.

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, 163082186 + ... + 163082685.

It is an arithmetic number, because the mean of its divisors is an integer number (9540322506).

Almost surely, 2^81541217750 is an apocalyptic number.

81541217750 is a deficient number, since it is larger than the sum of its proper divisors (71103942346).

81541217750 is a wasteful number, since it uses less digits than its factorization.

81541217750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326164888 (or 326164878 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 41.

The spelling of 81541217750 in words is "eighty-one billion, five hundred forty-one million, two hundred seventeen thousand, seven hundred fifty".