156666820540 has 12 divisors (see below), whose sum is σ = 329000323176. Its totient is φ = 62666728208.

The previous prime is 156666820507. The next prime is 156666820547. The reversal of 156666820540 is 45028666651.

It is a super-2 number, since 2×156666820540² (a number of 23 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 3916670494 + ... + 3916670533.

It is an arithmetic number, because the mean of its divisors is an integer number (27416693598).

Almost surely, 2^156666820540 is an apocalyptic number.

156666820540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156666820540 is an abundant number, since it is smaller than the sum of its proper divisors (172333502636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

156666820540 is a wasteful number, since it uses less digits than its factorization.

156666820540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833341036 (or 7833341034 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 156666820540 in words is "one hundred fifty-six billion, six hundred sixty-six million, eight hundred twenty thousand, five hundred forty".