156531444749 has 2 divisors, whose sum is σ = 156531444750.
Its totient is φ = 156531444748.
The previous prime is 156531444611. The next prime is 156531444757. The reversal of 156531444749 is 947444135651.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 130516012900 + 26015431849 = 361270^2 + 161293^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-156531444749 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 156531444749.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (156531444779) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78265722374 + 78265722375.
It is an arithmetic number, because the mean of its divisors is an integer number (78265722375).
Almost surely, 2156531444749 is an apocalyptic number.
It is an amenable number.
156531444749 is a deficient number, since it is larger than the sum of its proper divisors (1).
156531444749 is an equidigital number, since it uses as much as digits as its factorization.
156531444749 is an evil number, because the sum of its binary digits is even.
The product of its digits is 7257600, while the sum is 53.
The spelling of 156531444749 in words is "one hundred fifty-six billion, five hundred thirty-one million, four hundred forty-four thousand, seven hundred forty-nine".