1211560000557 has 16 divisors (see below), whose sum is σ = 1628170672128. Its totient is φ = 801345357360.

The previous prime is 1211560000531. The next prime is 1211560000577. The reversal of 1211560000557 is 7550000651121.

It is a happy number.

It is not a de Polignac number, because 1211560000557 - 2¹⁹ = 1211559476269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211560000507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1890333 + ... + 2448770.

It is an arithmetic number, because the mean of its divisors is an integer number (101760667008).

Almost surely, 2^{1211560000557} is an apocalyptic number.

It is an amenable number.

1211560000557 is a deficient number, since it is larger than the sum of its proper divisors (416610671571).

1211560000557 is a wasteful number, since it uses less digits than its factorization.

1211560000557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4339840.

The product of its (nonzero) digits is 10500, while the sum is 33.

Adding to 1211560000557 its reverse (7550000651121), we get a palindrome (8761560651678).

The spelling of 1211560000557 in words is "one trillion, two hundred eleven billion, five hundred sixty million, five hundred fifty-seven", and thus it is an aban number.