81259471780462 has 16 divisors (see below), whose sum is σ = 127228950092160. Its totient is φ = 38850938740152.

The previous prime is 81259471780451. The next prime is 81259471780463. The reversal of 81259471780462 is 26408717495218.

It is a junction number, because it is equal to n+sod(n) for n = 81259471780394 and 81259471780403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81259471780463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279100512 + ... + 279391507.

It is an arithmetic number, because the mean of its divisors is an integer number (7951809380760).

Almost surely, 2^{81259471780462} is an apocalyptic number.

81259471780462 is a deficient number, since it is larger than the sum of its proper divisors (45969478311698).

81259471780462 is a wasteful number, since it uses less digits than its factorization.

81259471780462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558495207.

The product of its (nonzero) digits is 54190080, while the sum is 64.

The spelling of 81259471780462 in words is "eighty-one trillion, two hundred fifty-nine billion, four hundred seventy-one million, seven hundred eighty thousand, four hundred sixty-two".