14221781557 has 4 divisors (see below), whose sum is σ = 14680548736. Its totient is φ = 13763014380.

The previous prime is 14221781527. The next prime is 14221781597. The reversal of 14221781557 is 75518712241.

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 14221781557 - 2¹⁵ = 14221748789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14221781507) 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, 229383543 + ... + 229383604.

It is an arithmetic number, because the mean of its divisors is an integer number (3670137184).

Almost surely, 2^14221781557 is an apocalyptic number.

It is an amenable number.

14221781557 is a deficient number, since it is larger than the sum of its proper divisors (458767179).

14221781557 is an equidigital number, since it uses as much as digits as its factorization.

14221781557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458767178.

The product of its digits is 156800, while the sum is 43.

The spelling of 14221781557 in words is "fourteen billion, two hundred twenty-one million, seven hundred eighty-one thousand, five hundred fifty-seven".