11651782961 has 24 divisors (see below), whose sum is σ = 14991275880. Its totient is φ = 8969812992.

The previous prime is 11651782943. The next prime is 11651782969. The reversal of 11651782961 is 16928715611.

It can be written as a sum of positive squares in 4 ways, for example, as 3823072561 + 7828710400 = 61831^2 + 88480^2 .

It is not a de Polignac number, because 11651782961 - 2¹⁰ = 11651781937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11651782969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223616 + ... + 270753.

It is an arithmetic number, because the mean of its divisors is an integer number (624636495).

Almost surely, 2^11651782961 is an apocalyptic number.

It is an amenable number.

11651782961 is a deficient number, since it is larger than the sum of its proper divisors (3339492919).

11651782961 is a wasteful number, since it uses less digits than its factorization.

11651782961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494433 (or 494426 counting only the distinct ones).

The product of its digits is 181440, while the sum is 47.

The spelling of 11651782961 in words is "eleven billion, six hundred fifty-one million, seven hundred eighty-two thousand, nine hundred sixty-one".