1666156201 has 8 divisors (see below), whose sum is σ = 1691832384. Its totient is φ = 1640503920.

The previous prime is 1666156187. The next prime is 1666156249. The reversal of 1666156201 is 1026516661.

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 1666156201 - 2¹³ = 1666148009 is a prime.

It is a super-2 number, since 2×1666156201² = 5552152972261504802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666156291) 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, 177051 + ... + 186223.

It is an arithmetic number, because the mean of its divisors is an integer number (211479048).

Almost surely, 2^1666156201 is an apocalyptic number.

It is an amenable number.

1666156201 is a deficient number, since it is larger than the sum of its proper divisors (25676183).

1666156201 is an equidigital number, since it uses as much as digits as its factorization.

1666156201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11951.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1666156201 is about 40818.5766655331. The cubic root of 1666156201 is about 1185.5100443426.

The spelling of 1666156201 in words is "one billion, six hundred sixty-six million, one hundred fifty-six thousand, two hundred one".