81660414454 has 8 divisors (see below), whose sum is σ = 122998882248. Its totient is φ = 40660787040.

The previous prime is 81660414449. The next prime is 81660414463. The reversal of 81660414454 is 45441406618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81660414454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84709492 + ... + 84710455.

It is an arithmetic number, because the mean of its divisors is an integer number (15374860281).

Almost surely, 2^81660414454 is an apocalyptic number.

81660414454 is a deficient number, since it is larger than the sum of its proper divisors (41338467794).

81660414454 is a wasteful number, since it uses less digits than its factorization.

81660414454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169420190.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 81660414454 in words is "eighty-one billion, six hundred sixty million, four hundred fourteen thousand, four hundred fifty-four".