16267155561 has 24 divisors (see below), whose sum is σ = 25025850304. Its totient is φ = 10551662640.

The previous prime is 16267155529. The next prime is 16267155563. The reversal of 16267155561 is 16555176261.

It is a happy number.

16267155561 is a `hidden beast` number, since 1 + 6 + 26 + 71 + 5 + 556 + 1 = 666.

It is not a de Polignac number, because 16267155561 - 2⁵ = 16267155529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16267155563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 895645 + ... + 913626.

Almost surely, 2^16267155561 is an apocalyptic number.

It is an amenable number.

16267155561 is a deficient number, since it is larger than the sum of its proper divisors (8758694743).

16267155561 is an equidigital number, since it uses as much as digits as its factorization.

16267155561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809323 (or 1809311 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 16267155561 in words is "sixteen billion, two hundred sixty-seven million, one hundred fifty-five thousand, five hundred sixty-one".