16531655973 has 32 divisors (see below), whose sum is σ = 26298218496. Its totient is φ = 9031860288.

The previous prime is 16531655969. The next prime is 16531655999. The reversal of 16531655973 is 37955613561.

It is not a de Polignac number, because 16531655973 - 2² = 16531655969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16531655963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1289511 + ... + 1302267.

It is an arithmetic number, because the mean of its divisors is an integer number (821819328).

Almost surely, 2^16531655973 is an apocalyptic number.

It is an amenable number.

16531655973 is a deficient number, since it is larger than the sum of its proper divisors (9766562523).

16531655973 is a wasteful number, since it uses less digits than its factorization.

16531655973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15473.

The product of its digits is 2551500, while the sum is 51.

The spelling of 16531655973 in words is "sixteen billion, five hundred thirty-one million, six hundred fifty-five thousand, nine hundred seventy-three".