1566166616650 has 12 divisors (see below), whose sum is σ = 2913069907062. Its totient is φ = 626466646640.

The previous prime is 1566166616627. The next prime is 1566166616659. The reversal of 1566166616650 is 566166616651.

It can be written as a sum of positive squares in 3 ways, for example, as 1159840687681 + 406325928969 = 1076959^2 + 637437^2 .

It is a super-2 number, since 2×1566166616650² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1566166616591 and 1566166616600.

It is not an unprimeable number, because it can be changed into a prime (1566166616659) 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 in 5 ways as a sum of consecutive naturals, for example, 15661666117 + ... + 15661666216.

Almost surely, 2^{1566166616650} is an apocalyptic number.

1566166616650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1566166616650 is a deficient number, since it is larger than the sum of its proper divisors (1346903290412).

1566166616650 is a wasteful number, since it uses less digits than its factorization.

1566166616650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31323332345 (or 31323332340 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 55.

Subtracting from 1566166616650 its reverse (566166616651), we obtain a palindrome (999999999999).

The spelling of 1566166616650 in words is "one trillion, five hundred sixty-six billion, one hundred sixty-six million, six hundred sixteen thousand, six hundred fifty".