11961756577 has 8 divisors (see below), whose sum is σ = 12109797440. Its totient is φ = 11814329520.

The previous prime is 11961756571. The next prime is 11961756607. The reversal of 11961756577 is 77565716911.

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 11961756577 - 2³¹ = 9814272929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11961756571) 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, 114174 + ... + 192247.

It is an arithmetic number, because the mean of its divisors is an integer number (1513724680).

Almost surely, 2^11961756577 is an apocalyptic number.

It is an amenable number.

11961756577 is a deficient number, since it is larger than the sum of its proper divisors (148040863).

11961756577 is a wasteful number, since it uses less digits than its factorization.

11961756577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306903.

The product of its digits is 2778300, while the sum is 55.

The spelling of 11961756577 in words is "eleven billion, nine hundred sixty-one million, seven hundred fifty-six thousand, five hundred seventy-seven".