666156101611 has 32 divisors (see below), whose sum is σ = 901247187456. Its totient is φ = 475495488000.

The previous prime is 666156101591. The next prime is 666156101627. The reversal of 666156101611 is 116101651666.

It is not a de Polignac number, because 666156101611 - 2¹⁷ = 666155970539 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666156101311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2408910 + ... + 2671171.

It is an arithmetic number, because the mean of its divisors is an integer number (28163974608).

Almost surely, 2^666156101611 is an apocalyptic number.

666156101611 is a deficient number, since it is larger than the sum of its proper divisors (235091085845).

666156101611 is a wasteful number, since it uses less digits than its factorization.

666156101611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080243.

The product of its (nonzero) digits is 38880, while the sum is 40.

It can be divided in two parts, 666156 and 101611, that added together give a palindrome (767767).

The spelling of 666156101611 in words is "six hundred sixty-six billion, one hundred fifty-six million, one hundred one thousand, six hundred eleven".