1666230555 has 64 divisors (see below), whose sum is σ = 3111943680. Its totient is φ = 752716800.

The previous prime is 1666230523. The next prime is 1666230569. The reversal of 1666230555 is 5550326661.

It is not a de Polignac number, because 1666230555 - 2⁵ = 1666230523 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 186879 + ... + 195591.

It is an arithmetic number, because the mean of its divisors is an integer number (48624120).

Almost surely, 2^1666230555 is an apocalyptic number.

1666230555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666230555 is a deficient number, since it is larger than the sum of its proper divisors (1445713125).

1666230555 is a wasteful number, since it uses less digits than its factorization.

1666230555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8812.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 1666230555 is about 40819.4874416620. The cubic root of 1666230555 is about 1185.5276789643.

It can be divided in two parts, 1666 and 230555, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 1666230555 in words is "one billion, six hundred sixty-six million, two hundred thirty thousand, five hundred fifty-five".