81382204070 has 16 divisors (see below), whose sum is σ = 146493958320. Its totient is φ = 32551550304.

The previous prime is 81382204027. The next prime is 81382204093. The reversal of 81382204070 is 7040228318.

It is a super-2 number, since 2×81382204070² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81382204070.

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, 112601 + ... + 418859.

It is an arithmetic number, because the mean of its divisors is an integer number (9155872395).

Almost surely, 2^81382204070 is an apocalyptic number.

81382204070 is a deficient number, since it is larger than the sum of its proper divisors (65111754250).

81382204070 is a wasteful number, since it uses less digits than its factorization.

81382204070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332839.

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 81382204070 in words is "eighty-one billion, three hundred eighty-two million, two hundred four thousand, seventy".