156801188881 has 8 divisors (see below), whose sum is σ = 160996586184. Its totient is φ = 152623457280.

The previous prime is 156801188809. The next prime is 156801188897. The reversal of 156801188881 is 188881108651.

It can be written as a sum of positive squares in 4 ways, for example, as 111091600 + 156690097281 = 10540^2 + 395841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156801188881 is a prime.

It is a super-2 number, since 2×156801188881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156801188801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4398436 + ... + 4433941.

It is an arithmetic number, because the mean of its divisors is an integer number (20124573273).

Almost surely, 2^156801188881 is an apocalyptic number.

It is an amenable number.

156801188881 is a deficient number, since it is larger than the sum of its proper divisors (4195397303).

156801188881 is an equidigital number, since it uses as much as digits as its factorization.

156801188881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8832851.

The product of its (nonzero) digits is 983040, while the sum is 55.

The spelling of 156801188881 in words is "one hundred fifty-six billion, eight hundred one million, one hundred eighty-eight thousand, eight hundred eighty-one".