11554221857 has 4 divisors (see below), whose sum is σ = 11554798896. Its totient is φ = 11553644820.

The previous prime is 11554221839. The next prime is 11554221869. The reversal of 11554221857 is 75812245511.

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 11554221857 - 2¹² = 11554217761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11554220857) 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, 257363 + ... + 298904.

It is an arithmetic number, because the mean of its divisors is an integer number (2888699724).

Almost surely, 2^11554221857 is an apocalyptic number.

It is an amenable number.

11554221857 is a deficient number, since it is larger than the sum of its proper divisors (577039).

11554221857 is an equidigital number, since it uses as much as digits as its factorization.

11554221857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577038.

The product of its digits is 112000, while the sum is 41.

The spelling of 11554221857 in words is "eleven billion, five hundred fifty-four million, two hundred twenty-one thousand, eight hundred fifty-seven".