1581266542942 has 8 divisors (see below), whose sum is σ = 2371910721696. Its totient is φ = 790629635712.

The previous prime is 1581266542913. The next prime is 1581266542963. The reversal of 1581266542942 is 2492456621851.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1237123 + ... + 2166334.

It is an arithmetic number, because the mean of its divisors is an integer number (296488840212).

Almost surely, 2^{1581266542942} is an apocalyptic number.

1581266542942 is a deficient number, since it is larger than the sum of its proper divisors (790644178754).

1581266542942 is a wasteful number, since it uses less digits than its factorization.

1581266542942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635762.

The product of its digits is 8294400, while the sum is 55.

The spelling of 1581266542942 in words is "one trillion, five hundred eighty-one billion, two hundred sixty-six million, five hundred forty-two thousand, nine hundred forty-two".