11986509601 has 4 divisors (see below), whose sum is σ = 13076192304. Its totient is φ = 10896826900.

The previous prime is 11986509539. The next prime is 11986509629. The reversal of 11986509601 is 10690568911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11986509601 - 2¹³ = 11986501409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11986509701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544841335 + ... + 544841356.

It is an arithmetic number, because the mean of its divisors is an integer number (3269048076).

Almost surely, 2^11986509601 is an apocalyptic number.

11986509601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11986509601 is a deficient number, since it is larger than the sum of its proper divisors (1089682703).

11986509601 is a wasteful number, since it uses less digits than its factorization.

11986509601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089682702.

The product of its (nonzero) digits is 116640, while the sum is 46.

The spelling of 11986509601 in words is "eleven billion, nine hundred eighty-six million, five hundred nine thousand, six hundred one".