11965571952 has 40 divisors (see below), whose sum is σ = 31908195840. Its totient is φ = 3859861440.

The previous prime is 11965571951. The next prime is 11965571987. The reversal of 11965571952 is 25917556911.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 11965571895 and 11965571904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11965571951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4019202 + ... + 4022177.

It is an arithmetic number, because the mean of its divisors is an integer number (797704896).

Almost surely, 2^11965571952 is an apocalyptic number.

11965571952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11965571952 is an abundant number, since it is smaller than the sum of its proper divisors (19942623888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11965571952 is a wasteful number, since it uses less digits than its factorization.

11965571952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8041421 (or 8041415 counting only the distinct ones).

The product of its digits is 850500, while the sum is 51.

The spelling of 11965571952 in words is "eleven billion, nine hundred sixty-five million, five hundred seventy-one thousand, nine hundred fifty-two".