1666615151 has 8 divisors (see below), whose sum is σ = 1698246144. Its totient is φ = 1635183000.

The previous prime is 1666615141. The next prime is 1666615177. The reversal of 1666615151 is 1515166661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666615151 - 2³⁰ = 592873327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666615141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32735 + ... + 66368.

It is an arithmetic number, because the mean of its divisors is an integer number (212280768).

Almost surely, 2^1666615151 is an apocalyptic number.

1666615151 is a deficient number, since it is larger than the sum of its proper divisors (31630993).

1666615151 is an equidigital number, since it uses as much as digits as its factorization.

1666615151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99421.

The product of its digits is 32400, while the sum is 38.

The square root of 1666615151 is about 40824.1981060253. The cubic root of 1666615151 is about 1185.6188856555.

The spelling of 1666615151 in words is "one billion, six hundred sixty-six million, six hundred fifteen thousand, one hundred fifty-one".