1566241421 has 4 divisors (see below), whose sum is σ = 1648675200. Its totient is φ = 1483807644.

The previous prime is 1566241387. The next prime is 1566241423. The reversal of 1566241421 is 1241426651.

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 1566241421 - 2¹⁰ = 1566240397 is a prime.

It is a super-2 number, since 2×1566241421² = 4906224377712198482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566241423) 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, 41216861 + ... + 41216898.

It is an arithmetic number, because the mean of its divisors is an integer number (412168800).

Almost surely, 2^1566241421 is an apocalyptic number.

It is an amenable number.

1566241421 is a deficient number, since it is larger than the sum of its proper divisors (82433779).

1566241421 is an equidigital number, since it uses as much as digits as its factorization.

1566241421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82433778.

The product of its digits is 11520, while the sum is 32.

The square root of 1566241421 is about 39575.7681037273. The cubic root of 1566241421 is about 1161.3226641482.

The spelling of 1566241421 in words is "one billion, five hundred sixty-six million, two hundred forty-one thousand, four hundred twenty-one".