16665020553 has 16 divisors (see below), whose sum is σ = 23193317376. Its totient is φ = 10623668880.

The previous prime is 16665020551. The next prime is 16665020587. The reversal of 16665020553 is 35502056661.

It is not a de Polignac number, because 16665020553 - 2¹ = 16665020551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16665020551) 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, 196776 + ... + 268422.

It is an arithmetic number, because the mean of its divisors is an integer number (1449582336).

Almost surely, 2^16665020553 is an apocalyptic number.

It is an amenable number.

16665020553 is a deficient number, since it is larger than the sum of its proper divisors (6528296823).

16665020553 is a wasteful number, since it uses less digits than its factorization.

16665020553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75044.

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 16665020553 in words is "sixteen billion, six hundred sixty-five million, twenty thousand, five hundred fifty-three".