156398969805 has 128 divisors (see below), whose sum is σ = 277298380800. Its totient is φ = 74807276544.

The previous prime is 156398969773. The next prime is 156398969809. The reversal of 156398969805 is 508969893651.

156398969805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 156398969805 - 2⁵ = 156398969773 is a prime.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 156398969805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156398969809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 393951867 + ... + 393952263.

It is an arithmetic number, because the mean of its divisors is an integer number (2166393600).

Almost surely, 2^156398969805 is an apocalyptic number.

156398969805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

156398969805 is a deficient number, since it is larger than the sum of its proper divisors (120899410995).

156398969805 is a wasteful number, since it uses less digits than its factorization.

156398969805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843.

The product of its (nonzero) digits is 125971200, while the sum is 69.

The spelling of 156398969805 in words is "one hundred fifty-six billion, three hundred ninety-eight million, nine hundred sixty-nine thousand, eight hundred five".