81694481310 has 128 divisors (see below), whose sum is σ = 244810460160. Its totient is φ = 19235069568.

The previous prime is 81694481303. The next prime is 81694481311. The reversal of 81694481310 is 1318449618.

81694481310 is a `hidden beast` number, since 8 + 169 + 4 + 481 + 3 + 1 + 0 = 666.

It is a super-2 number, since 2×81694481310² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81694481311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 425244 + ... + 586703.

It is an arithmetic number, because the mean of its divisors is an integer number (1912581720).

Almost surely, 2^81694481310 is an apocalyptic number.

81694481310 is an abundant number, since it is smaller than the sum of its proper divisors (163115978850).

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

81694481310 is a wasteful number, since it uses less digits than its factorization.

81694481310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011999 (or 1011993 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 81694481310 in words is "eighty-one billion, six hundred ninety-four million, four hundred eighty-one thousand, three hundred ten".