1666130340555 has 12 divisors (see below), whose sum is σ = 2887959257040. Its totient is φ = 888602848272.

The previous prime is 1666130340533. The next prime is 1666130340577. The reversal of 1666130340555 is 5550430316661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1666130340533) and next prime (1666130340577).

It is not a de Polignac number, because 1666130340555 - 2⁸ = 1666130340299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 37025118679 = 1666130340555 / (1 + 6 + 6 + 6 + 1 + 3 + 0 + 3 + 4 + 0 + 5 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1666130340555.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 18512559295 + ... + 18512559384.

It is an arithmetic number, because the mean of its divisors is an integer number (240663271420).

Almost surely, 2^{1666130340555} is an apocalyptic number.

1666130340555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666130340555 is a deficient number, since it is larger than the sum of its proper divisors (1221828916485).

1666130340555 is a wasteful number, since it uses less digits than its factorization.

1666130340555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37025118690 (or 37025118687 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 1666130340555 in words is "one trillion, six hundred sixty-six billion, one hundred thirty million, three hundred forty thousand, five hundred fifty-five".