81653554511 has 16 divisors (see below), whose sum is σ = 83300659200. Its totient is φ = 80027589600.

The previous prime is 81653554487. The next prime is 81653554529. The reversal of 81653554511 is 11545535618.

It is a cyclic number.

It is not a de Polignac number, because 81653554511 - 2³⁴ = 64473685327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81653554531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3715646 + ... + 3737556.

It is an arithmetic number, because the mean of its divisors is an integer number (5206291200).

Almost surely, 2^81653554511 is an apocalyptic number.

81653554511 is a deficient number, since it is larger than the sum of its proper divisors (1647104689).

81653554511 is a wasteful number, since it uses less digits than its factorization.

81653554511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22390.

The product of its digits is 360000, while the sum is 44.

The spelling of 81653554511 in words is "eighty-one billion, six hundred fifty-three million, five hundred fifty-four thousand, five hundred eleven".