11955811803 has 8 divisors (see below), whose sum is σ = 17167319568. Its totient is φ = 7357422624.

The previous prime is 11955811771. The next prime is 11955811873. The reversal of 11955811803 is 30811855911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11955811803 - 2⁵ = 11955811771 is a prime.

It is a super-2 number, since 2×11955811803² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11955811873) 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, 153279600 + ... + 153279677.

It is an arithmetic number, because the mean of its divisors is an integer number (2145914946).

Almost surely, 2^11955811803 is an apocalyptic number.

11955811803 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11955811803 is a deficient number, since it is larger than the sum of its proper divisors (5211507765).

11955811803 is a wasteful number, since it uses less digits than its factorization.

11955811803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306559293.

The product of its (nonzero) digits is 43200, while the sum is 42.

The spelling of 11955811803 in words is "eleven billion, nine hundred fifty-five million, eight hundred eleven thousand, eight hundred three".