81518854419 has 6 divisors (see below), whose sum is σ = 117749456396. Its totient is φ = 54345902940.

The previous prime is 81518854411. The next prime is 81518854537. The reversal of 81518854419 is 91445881518.

81518854419 is a `hidden beast` number, since 8 + 1 + 5 + 1 + 88 + 544 + 19 = 666.

It is not a de Polignac number, because 81518854419 - 2³ = 81518854411 is a prime.

It is a super-2 number, since 2×81518854419² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81518854411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4528825237 + ... + 4528825254.

Almost surely, 2^81518854419 is an apocalyptic number.

81518854419 is a deficient number, since it is larger than the sum of its proper divisors (36230601977).

81518854419 is a wasteful number, since it uses less digits than its factorization.

81518854419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9057650497 (or 9057650494 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 54.

The spelling of 81518854419 in words is "eighty-one billion, five hundred eighteen million, eight hundred fifty-four thousand, four hundred nineteen".