11949561605 has 8 divisors (see below), whose sum is σ = 15094183200. Its totient is φ = 9056509776.

The previous prime is 11949561553. The next prime is 11949561607. The reversal of 11949561605 is 50616594911.

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 11949561605 - 2¹² = 11949557509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11949561605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11949561607) 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, 62892335 + ... + 62892524.

It is an arithmetic number, because the mean of its divisors is an integer number (1886772900).

Almost surely, 2^11949561605 is an apocalyptic number.

It is an amenable number.

11949561605 is a deficient number, since it is larger than the sum of its proper divisors (3144621595).

11949561605 is a wasteful number, since it uses less digits than its factorization.

11949561605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125784883.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 11949561605 in words is "eleven billion, nine hundred forty-nine million, five hundred sixty-one thousand, six hundred five".