1581266496 has 56 divisors (see below), whose sum is σ = 4272808320. Its totient is φ = 515871232.

The previous prime is 1581266473. The next prime is 1581266497. The reversal of 1581266496 is 6946621851.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1581266497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78591 + ... + 96638.

Almost surely, 2^1581266496 is an apocalyptic number.

1581266496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1581266496 is an abundant number, since it is smaller than the sum of its proper divisors (2691541824).

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

1581266496 is a wasteful number, since it uses less digits than its factorization.

1581266496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175291 (or 175281 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 1581266496 is about 39765.1417198531. The cubic root of 1581266496 is about 1165.0244049239.

The spelling of 1581266496 in words is "one billion, five hundred eighty-one million, two hundred sixty-six thousand, four hundred ninety-six".