1566542542 has 4 divisors (see below), whose sum is σ = 2349813816. Its totient is φ = 783271270.

The previous prime is 1566542521. The next prime is 1566542543. The reversal of 1566542542 is 2452456651.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1566542495 and 1566542504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566542543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391635634 + ... + 391635637.

It is an arithmetic number, because the mean of its divisors is an integer number (587453454).

Almost surely, 2^1566542542 is an apocalyptic number.

1566542542 is a deficient number, since it is larger than the sum of its proper divisors (783271274).

1566542542 is an equidigital number, since it uses as much as digits as its factorization.

1566542542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783271273.

The product of its digits is 288000, while the sum is 40.

The square root of 1566542542 is about 39579.5722816708. The cubic root of 1566542542 is about 1161.3970835467.

The spelling of 1566542542 in words is "one billion, five hundred sixty-six million, five hundred forty-two thousand, five hundred forty-two".