11956970861 has 6 divisors (see below), whose sum is σ = 13142786286. Its totient is φ = 10869973400.

The previous prime is 11956970821. The next prime is 11956970873. The reversal of 11956970861 is 16807965911.

11956970861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9468457636 + 2488513225 = 97306^2 + 49885^2 .

It is not a de Polignac number, because 11956970861 - 2⁶ = 11956970797 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 (11956970821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49408850 + ... + 49409091.

It is an arithmetic number, because the mean of its divisors is an integer number (2190464381).

Almost surely, 2^11956970861 is an apocalyptic number.

11956970861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11956970861 is a deficient number, since it is larger than the sum of its proper divisors (1185815425).

11956970861 is an equidigital number, since it uses as much as digits as its factorization.

11956970861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98817963 (or 98817952 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 11956970861 in words is "eleven billion, nine hundred fifty-six million, nine hundred seventy thousand, eight hundred sixty-one".