11949561795 has 64 divisors (see below), whose sum is σ = 21725107200. Its totient is φ = 5575933440.

The previous prime is 11949561791. The next prime is 11949561857. The reversal of 11949561795 is 59716594911.

It is a happy number.

It is not a de Polignac number, because 11949561795 - 2² = 11949561791 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (11949561791) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 158665 + ... + 221525.

It is an arithmetic number, because the mean of its divisors is an integer number (339454800).

Almost surely, 2^11949561795 is an apocalyptic number.

11949561795 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11949561795 is a deficient number, since it is larger than the sum of its proper divisors (9775545405).

11949561795 is a wasteful number, since it uses less digits than its factorization.

11949561795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62940.

The product of its digits is 3061800, while the sum is 57.

The spelling of 11949561795 in words is "eleven billion, nine hundred forty-nine million, five hundred sixty-one thousand, seven hundred ninety-five".