81614517946 has 16 divisors (see below), whose sum is σ = 137570961024. Its totient is φ = 36030489264.

The previous prime is 81614517913. The next prime is 81614517947. The reversal of 81614517946 is 64971541618.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81614517893 and 81614517902.

It is not an unprimeable number, because it can be changed into a prime (81614517947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68238966 + ... + 68240161.

It is an arithmetic number, because the mean of its divisors is an integer number (8598185064).

Almost surely, 2^81614517946 is an apocalyptic number.

81614517946 is a deficient number, since it is larger than the sum of its proper divisors (55956443078).

81614517946 is a wasteful number, since it uses less digits than its factorization.

81614517946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136479165.

The product of its digits is 1451520, while the sum is 52.

The spelling of 81614517946 in words is "eighty-one billion, six hundred fourteen million, five hundred seventeen thousand, nine hundred forty-six".