81484551053 has 4 divisors (see below), whose sum is σ = 81485668320. Its totient is φ = 81483433788.

The previous prime is 81484551019. The next prime is 81484551097. The reversal of 81484551053 is 35015548418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81484551053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81484550995 and 81484551013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81484551353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440975 + ... + 597852.

It is an arithmetic number, because the mean of its divisors is an integer number (20371417080).

Almost surely, 2^81484551053 is an apocalyptic number.

It is an amenable number.

81484551053 is a deficient number, since it is larger than the sum of its proper divisors (1117267).

81484551053 is a wasteful number, since it uses less digits than its factorization.

81484551053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117266.

The product of its (nonzero) digits is 384000, while the sum is 44.

The spelling of 81484551053 in words is "eighty-one billion, four hundred eighty-four million, five hundred fifty-one thousand, fifty-three".