156666106065601 has 16 divisors (see below), whose sum is σ = 171088342141248. Its totient is φ = 142273900641600.

The previous prime is 156666106065509. The next prime is 156666106065619. The reversal of 156666106065601 is 106560601666651.

It is a cyclic number.

It is not a de Polignac number, because 156666106065601 - 2³³ = 156657516131009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156666106060601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57334006 + ... + 60004336.

It is an arithmetic number, because the mean of its divisors is an integer number (10693021383828).

Almost surely, 2^{156666106065601} is an apocalyptic number.

156666106065601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156666106065601 is a deficient number, since it is larger than the sum of its proper divisors (14422236075647).

156666106065601 is a wasteful number, since it uses less digits than its factorization.

156666106065601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675952.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 156666106065601 in words is "one hundred fifty-six trillion, six hundred sixty-six billion, one hundred six million, sixty-five thousand, six hundred one".