16551763961 has 2 divisors, whose sum is σ = 16551763962. Its totient is φ = 16551763960.

The previous prime is 16551763957. The next prime is 16551763993. The reversal of 16551763961 is 16936715561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8979457600 + 7572306361 = 94760^2 + 87019^2 .

It is an emirp because it is prime and its reverse (16936715561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16551763961 - 2² = 16551763957 is a prime.

It is a super-3 number, since 3×16551763961³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16551763561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275881980 + 8275881981.

It is an arithmetic number, because the mean of its divisors is an integer number (8275881981).

Almost surely, 2^16551763961 is an apocalyptic number.

It is an amenable number.

16551763961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551763961 is an equidigital number, since it uses as much as digits as its factorization.

16551763961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 50.

The spelling of 16551763961 in words is "sixteen billion, five hundred fifty-one million, seven hundred sixty-three thousand, nine hundred sixty-one".