1163566421 has 4 divisors (see below), whose sum is σ = 1180933152. Its totient is φ = 1146199692.

The previous prime is 1163566387. The next prime is 1163566423. The reversal of 1163566421 is 1246653611.

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 1163566421 - 2¹⁸ = 1163304277 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 (1163566423) 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, 8683265 + ... + 8683398.

It is an arithmetic number, because the mean of its divisors is an integer number (295233288).

Almost surely, 2^1163566421 is an apocalyptic number.

It is an amenable number.

1163566421 is a deficient number, since it is larger than the sum of its proper divisors (17366731).

1163566421 is an equidigital number, since it uses as much as digits as its factorization.

1163566421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17366730.

The product of its digits is 25920, while the sum is 35.

The square root of 1163566421 is about 34111.0894138548. The cubic root of 1163566421 is about 1051.7932835240.

The spelling of 1163566421 in words is "one billion, one hundred sixty-three million, five hundred sixty-six thousand, four hundred twenty-one".