11990142897 has 4 divisors (see below), whose sum is σ = 15986857200. Its totient is φ = 7993428596.

The previous prime is 11990142839. The next prime is 11990142971. The reversal of 11990142897 is 79824109911.

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 11990142897 - 2¹⁶ = 11990077361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11990142797) 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, 1998357147 + ... + 1998357152.

It is an arithmetic number, because the mean of its divisors is an integer number (3996714300).

Almost surely, 2^11990142897 is an apocalyptic number.

It is an amenable number.

11990142897 is a deficient number, since it is larger than the sum of its proper divisors (3996714303).

11990142897 is an equidigital number, since it uses as much as digits as its factorization.

11990142897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996714302.

The product of its (nonzero) digits is 326592, while the sum is 51.

The spelling of 11990142897 in words is "eleven billion, nine hundred ninety million, one hundred forty-two thousand, eight hundred ninety-seven".