1566620440231 has 24 divisors (see below), whose sum is σ = 2105012656656. Its totient is φ = 1148934769920.

The previous prime is 1566620440169. The next prime is 1566620440247. The reversal of 1566620440231 is 1320440266651.

It is not a de Polignac number, because 1566620440231 - 2⁷ = 1566620440103 is a prime.

It is a super-2 number, since 2×1566620440231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566620443231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85477056 + ... + 85495381.

It is an arithmetic number, because the mean of its divisors is an integer number (87708860694).

Almost surely, 2^{1566620440231} is an apocalyptic number.

1566620440231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1566620440231 is a deficient number, since it is larger than the sum of its proper divisors (538392216425).

1566620440231 is a wasteful number, since it uses less digits than its factorization.

1566620440231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170972479 (or 170972472 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 1566620440231 in words is "one trillion, five hundred sixty-six billion, six hundred twenty million, four hundred forty thousand, two hundred thirty-one".