9549664901551 has 4 divisors (see below), whose sum is σ = 9619370484912. Its totient is φ = 9479959318192.

The previous prime is 9549664901507. The next prime is 9549664901599. The reversal of 9549664901551 is 1551094669459.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9549664901551 - 2¹⁹ = 9549664377263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9549664901951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34852791475 + ... + 34852791748.

It is an arithmetic number, because the mean of its divisors is an integer number (2404842621228).

Almost surely, 2^{9549664901551} is an apocalyptic number.

9549664901551 is a deficient number, since it is larger than the sum of its proper divisors (69705583361).

9549664901551 is a wasteful number, since it uses less digits than its factorization.

9549664901551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69705583360.

The product of its (nonzero) digits is 52488000, while the sum is 64.

The spelling of 9549664901551 in words is "nine trillion, five hundred forty-nine billion, six hundred sixty-four million, nine hundred one thousand, five hundred fifty-one".