81854577963 has 12 divisors (see below), whose sum is σ = 118320900048. Its totient is φ = 54529791120.

The previous prime is 81854577953. The next prime is 81854577971. The reversal of 81854577963 is 36977545818.

81854577963 is a `hidden beast` number, since 8 + 1 + 8 + 54 + 577 + 9 + 6 + 3 = 666.

It is not a de Polignac number, because 81854577963 - 2¹⁰ = 81854576939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81854577963.

It is not an unprimeable number, because it can be changed into a prime (81854577913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3314308 + ... + 3338913.

It is an arithmetic number, because the mean of its divisors is an integer number (9860075004).

Almost surely, 2^81854577963 is an apocalyptic number.

81854577963 is a deficient number, since it is larger than the sum of its proper divisors (36466322085).

81854577963 is a wasteful number, since it uses less digits than its factorization.

81854577963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654594 (or 6654591 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 63.

The spelling of 81854577963 in words is "eighty-one billion, eight hundred fifty-four million, five hundred seventy-seven thousand, nine hundred sixty-three".