81981030453 has 8 divisors (see below), whose sum is σ = 124923475008. Its totient is φ = 46846303104.

The previous prime is 81981030449. The next prime is 81981030473. The reversal of 81981030453 is 35403018918.

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

It is not a de Polignac number, because 81981030453 - 2² = 81981030449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81981030433) 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, 1951929276 + ... + 1951929317.

It is an arithmetic number, because the mean of its divisors is an integer number (15615434376).

Almost surely, 2^81981030453 is an apocalyptic number.

It is an amenable number.

81981030453 is a deficient number, since it is larger than the sum of its proper divisors (42942444555).

81981030453 is a wasteful number, since it uses less digits than its factorization.

81981030453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903858603.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 81981030453 in words is "eighty-one billion, nine hundred eighty-one million, thirty thousand, four hundred fifty-three".