11651171561 has 8 divisors (see below), whose sum is σ = 12520663200. Its totient is φ = 10802138688.

The previous prime is 11651171557. The next prime is 11651171669. The reversal of 11651171561 is 16517115611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11651171561 - 2² = 11651171557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11651171501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5113511 + ... + 5115788.

It is an arithmetic number, because the mean of its divisors is an integer number (1565082900).

Almost surely, 2^11651171561 is an apocalyptic number.

It is an amenable number.

11651171561 is a deficient number, since it is larger than the sum of its proper divisors (869491639).

11651171561 is a wasteful number, since it uses less digits than its factorization.

11651171561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10229383.

The product of its digits is 6300, while the sum is 35.

The spelling of 11651171561 in words is "eleven billion, six hundred fifty-one million, one hundred seventy-one thousand, five hundred sixty-one".