1566954401 has 4 divisors (see below), whose sum is σ = 1567035204. Its totient is φ = 1566873600.

The previous prime is 1566954383. The next prime is 1566954409. The reversal of 1566954401 is 1044596651.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1204090000 + 362864401 = 34700^2 + 19049^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566954401 - 2²² = 1562760097 is a prime.

It is a deceptive number, since it divides R_1566954400.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1566954409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8081 + ... + 56561.

It is an arithmetic number, because the mean of its divisors is an integer number (391758801).

Almost surely, 2^1566954401 is an apocalyptic number.

1566954401 is the 32321-st pentagonal number.

It is an amenable number.

1566954401 is a deficient number, since it is larger than the sum of its proper divisors (80803).

1566954401 is an equidigital number, since it uses as much as digits as its factorization.

1566954401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80802.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1566954401 is about 39584.7748635760. The cubic root of 1566954401 is about 1161.4988554245.

The spelling of 1566954401 in words is "one billion, five hundred sixty-six million, nine hundred fifty-four thousand, four hundred one".