156171622100201 has 4 divisors (see below), whose sum is σ = 156171762990804. Its totient is φ = 156171481209600.

The previous prime is 156171622100167. The next prime is 156171622100279. The reversal of 156171622100201 is 102001226171651.

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 117448133347801 + 38723488752400 = 10837349^2 + 6222820^2 .

It is a cyclic number.

It is not a de Polignac number, because 156171622100201 - 2¹⁰ = 156171622099177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156171622105201) 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, 68769320 + ... + 71003961.

It is an arithmetic number, because the mean of its divisors is an integer number (39042940747701).

Almost surely, 2^{156171622100201} is an apocalyptic number.

It is an amenable number.

156171622100201 is a deficient number, since it is larger than the sum of its proper divisors (140890603).

156171622100201 is a wasteful number, since it uses less digits than its factorization.

156171622100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140890602.

The product of its (nonzero) digits is 10080, while the sum is 35.

Adding to 156171622100201 its reverse (102001226171651), we get a palindrome (258172848271852).

The spelling of 156171622100201 in words is "one hundred fifty-six trillion, one hundred seventy-one billion, six hundred twenty-two million, one hundred thousand, two hundred one".