6156161800321 has 4 divisors (see below), whose sum is σ = 6629712708052. Its totient is φ = 5682610892592.

The previous prime is 6156161800309. The next prime is 6156161800361. The reversal of 6156161800321 is 1230081616516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4136667854400 + 2019493945921 = 2033880^2 + 1421089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6156161800321 - 2⁵ = 6156161800289 is a prime.

It is a super-2 number, since 2×6156161800321² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6156161800361) 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, 236775453846 + ... + 236775453871.

It is an arithmetic number, because the mean of its divisors is an integer number (1657428177013).

Almost surely, 2^{6156161800321} is an apocalyptic number.

It is an amenable number.

6156161800321 is a deficient number, since it is larger than the sum of its proper divisors (473550907731).

6156161800321 is a wasteful number, since it uses less digits than its factorization.

6156161800321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473550907730.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 6156161800321 in words is "six trillion, one hundred fifty-six billion, one hundred sixty-one million, eight hundred thousand, three hundred twenty-one".