16561766951 has 16 divisors (see below), whose sum is σ = 17120229984. Its totient is φ = 16009386624.

The previous prime is 16561766939. The next prime is 16561766959. The reversal of 16561766951 is 15966716561.

It is a cyclic number.

It is not a de Polignac number, because 16561766951 - 2¹⁴ = 16561750567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16561766893 and 16561766902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561766959) 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, 7382636 + ... + 7384878.

It is an arithmetic number, because the mean of its divisors is an integer number (1070014374).

Almost surely, 2^16561766951 is an apocalyptic number.

16561766951 is a deficient number, since it is larger than the sum of its proper divisors (558463033).

16561766951 is a wasteful number, since it uses less digits than its factorization.

16561766951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490.

The product of its digits is 2041200, while the sum is 53.

The spelling of 16561766951 in words is "sixteen billion, five hundred sixty-one million, seven hundred sixty-six thousand, nine hundred fifty-one".