16961509551 has 96 divisors (see below), whose sum is σ = 28810183680. Its totient is φ = 8676315648.

The previous prime is 16961509529. The next prime is 16961509559. The reversal of 16961509551 is 15590516961.

It is not a de Polignac number, because 16961509551 - 2⁵ = 16961509519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16961509551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16961509559) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15517761 + ... + 15518853.

It is an arithmetic number, because the mean of its divisors is an integer number (300106080).

Almost surely, 2^16961509551 is an apocalyptic number.

16961509551 is a deficient number, since it is larger than the sum of its proper divisors (11848674129).

16961509551 is a wasteful number, since it uses less digits than its factorization.

16961509551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 364500, while the sum is 48.

The spelling of 16961509551 in words is "sixteen billion, nine hundred sixty-one million, five hundred nine thousand, five hundred fifty-one".