81270217586 has 16 divisors (see below), whose sum is σ = 122906334336. Its totient is φ = 40302387216.

The previous prime is 81270217577. The next prime is 81270217627. The reversal of 81270217586 is 68571207218.

It is a self number, because there is not a number n which added to its sum of digits gives 81270217586.

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, 64826 + ... + 408341.

It is an arithmetic number, because the mean of its divisors is an integer number (7681645896).

Almost surely, 2^81270217586 is an apocalyptic number.

81270217586 is a deficient number, since it is larger than the sum of its proper divisors (41636116750).

81270217586 is a wasteful number, since it uses less digits than its factorization.

81270217586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473873.

The product of its (nonzero) digits is 376320, while the sum is 47.

The spelling of 81270217586 in words is "eighty-one billion, two hundred seventy million, two hundred seventeen thousand, five hundred eighty-six".