156494381921 has 2 divisors, whose sum is σ = 156494381922. Its totient is φ = 156494381920.

The previous prime is 156494381873. The next prime is 156494381929. The reversal of 156494381921 is 129183494651.

156494381921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84122621521 + 72371760400 = 290039^2 + 269020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156494381921 is a prime.

It is not a weakly prime, because it can be changed into another prime (156494381929) 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 as a sum of consecutive naturals, namely, 78247190960 + 78247190961.

It is an arithmetic number, because the mean of its divisors is an integer number (78247190961).

Almost surely, 2^156494381921 is an apocalyptic number.

It is an amenable number.

156494381921 is a deficient number, since it is larger than the sum of its proper divisors (1).

156494381921 is an equidigital number, since it uses as much as digits as its factorization.

156494381921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The spelling of 156494381921 in words is "one hundred fifty-six billion, four hundred ninety-four million, three hundred eighty-one thousand, nine hundred twenty-one".