1666622151 has 12 divisors (see below), whose sum is σ = 2407764112. Its totient is φ = 1110887136.

The previous prime is 1666622137. The next prime is 1666622173. The reversal of 1666622151 is 1512266661.

It is not a de Polignac number, because 1666622151 - 2²² = 1662427847 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 (1666626151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54270 + ... + 79236.

Almost surely, 2^1666622151 is an apocalyptic number.

1666622151 is a deficient number, since it is larger than the sum of its proper divisors (741141961).

1666622151 is a wasteful number, since it uses less digits than its factorization.

1666622151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32390 (or 32387 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1666622151 is about 40824.2838394013. The cubic root of 1666622151 is about 1185.6205455709.

The spelling of 1666622151 in words is "one billion, six hundred sixty-six million, six hundred twenty-two thousand, one hundred fifty-one".