16551083961 has 6 divisors (see below), whose sum is σ = 23907121290. Its totient is φ = 11034055968.

The previous prime is 16551083933. The next prime is 16551083987. The reversal of 16551083961 is 16938015561.

16551083961 is a `hidden beast` number, since 1 + 6 + 551 + 0 + 8 + 3 + 96 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8571056400 + 7980027561 = 92580^2 + 89331^2 .

It is not a de Polignac number, because 16551083961 - 2⁹ = 16551083449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16551083561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 919504656 + ... + 919504673.

It is an arithmetic number, because the mean of its divisors is an integer number (3984520215).

Almost surely, 2^16551083961 is an apocalyptic number.

It is an amenable number.

16551083961 is a deficient number, since it is larger than the sum of its proper divisors (7356037329).

16551083961 is a wasteful number, since it uses less digits than its factorization.

16551083961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839009335 (or 1839009332 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 16551083961 in words is "sixteen billion, five hundred fifty-one million, eighty-three thousand, nine hundred sixty-one".