156540461509 has 2 divisors, whose sum is σ = 156540461510. Its totient is φ = 156540461508.

The previous prime is 156540461503. The next prime is 156540461557. The reversal of 156540461509 is 905164045651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156487492225 + 52969284 = 395585^2 + 7278^2 .

It is a cyclic number.

It is not a de Polignac number, because 156540461509 - 2⁵ = 156540461477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156540461503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78270230754 + 78270230755.

It is an arithmetic number, because the mean of its divisors is an integer number (78270230755).

Almost surely, 2^156540461509 is an apocalyptic number.

It is an amenable number.

156540461509 is a deficient number, since it is larger than the sum of its proper divisors (1).

156540461509 is an equidigital number, since it uses as much as digits as its factorization.

156540461509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 156540461509 in words is "one hundred fifty-six billion, five hundred forty million, four hundred sixty-one thousand, five hundred nine".