156666820541 has 32 divisors (see below), whose sum is σ = 200673269760. Its totient is φ = 118737576000.

The previous prime is 156666820507. The next prime is 156666820547. The reversal of 156666820541 is 145028666651.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 156666820541 - 2¹⁴ = 156666804157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 156666820541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156666820547) 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, 10131866 + ... + 10147316.

It is an arithmetic number, because the mean of its divisors is an integer number (6271039680).

Almost surely, 2^156666820541 is an apocalyptic number.

156666820541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156666820541 is a deficient number, since it is larger than the sum of its proper divisors (44006449219).

156666820541 is a wasteful number, since it uses less digits than its factorization.

156666820541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19065.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 156666820541 in words is "one hundred fifty-six billion, six hundred sixty-six million, eight hundred twenty thousand, five hundred forty-one".