1666390151 has 8 divisors (see below), whose sum is σ = 1720725504. Its totient is φ = 1612091160.

The previous prime is 1666390139. The next prime is 1666390169. The reversal of 1666390151 is 1510936661.

It is a happy number.

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 1666390151 - 2³⁰ = 592648327 is a prime.

It is a super-2 number, since 2×1666390151² = 5553712270699605602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666390651) 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, 108326 + ... + 122748.

It is an arithmetic number, because the mean of its divisors is an integer number (215090688).

Almost surely, 2^1666390151 is an apocalyptic number.

1666390151 is a deficient number, since it is larger than the sum of its proper divisors (54335353).

1666390151 is a wasteful number, since it uses less digits than its factorization.

1666390151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18181.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1666390151 is about 40821.4422944609. The cubic root of 1666390151 is about 1185.5655287553.

The spelling of 1666390151 in words is "one billion, six hundred sixty-six million, three hundred ninety thousand, one hundred fifty-one".