1581323152956 has 12 divisors (see below), whose sum is σ = 3689754023592. Its totient is φ = 527107717648.

The previous prime is 1581323152879. The next prime is 1581323152991. The reversal of 1581323152956 is 6592513231851.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1581323152899 and 1581323152908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65888464695 + ... + 65888464718.

It is an arithmetic number, because the mean of its divisors is an integer number (307479501966).

Almost surely, 2^{1581323152956} is an apocalyptic number.

It is an amenable number.

1581323152956 is an abundant number, since it is smaller than the sum of its proper divisors (2108430870636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1581323152956 is a wasteful number, since it uses less digits than its factorization.

1581323152956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131776929420 (or 131776929418 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 51.

The spelling of 1581323152956 in words is "one trillion, five hundred eighty-one billion, three hundred twenty-three million, one hundred fifty-two thousand, nine hundred fifty-six".