16223432561 has 16 divisors (see below), whose sum is σ = 19245945600. Its totient is φ = 13380416448.

The previous prime is 16223432539. The next prime is 16223432581. The reversal of 16223432561 is 16523432261.

It is not a de Polignac number, because 16223432561 - 2⁶ = 16223432497 is a prime.

It is a super-2 number, since 2×16223432561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16223432521) 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, 76901 + ... + 195858.

It is an arithmetic number, because the mean of its divisors is an integer number (1202871600).

Almost surely, 2^16223432561 is an apocalyptic number.

It is an amenable number.

16223432561 is a deficient number, since it is larger than the sum of its proper divisors (3022513039).

16223432561 is a wasteful number, since it uses less digits than its factorization.

16223432561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273088.

The product of its digits is 51840, while the sum is 35.

The spelling of 16223432561 in words is "sixteen billion, two hundred twenty-three million, four hundred thirty-two thousand, five hundred sixty-one".