81658378462 has 16 divisors (see below), whose sum is σ = 124765701984. Its totient is φ = 40072716000.

The previous prime is 81658378457. The next prime is 81658378469. The reversal of 81658378462 is 26487385618.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81658378397 and 81658378406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81658378469) 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, 669714 + ... + 782197.

It is an arithmetic number, because the mean of its divisors is an integer number (7797856374).

Almost surely, 2^81658378462 is an apocalyptic number.

81658378462 is a deficient number, since it is larger than the sum of its proper divisors (43107323522).

81658378462 is a wasteful number, since it uses less digits than its factorization.

81658378462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452435.

The product of its digits is 15482880, while the sum is 58.

The spelling of 81658378462 in words is "eighty-one billion, six hundred fifty-eight million, three hundred seventy-eight thousand, four hundred sixty-two".