1331557874018 has 4 divisors (see below), whose sum is σ = 1997336811030. Its totient is φ = 665778937008.

The previous prime is 1331557873991. The next prime is 1331557874033. The reversal of 1331557874018 is 8104787551331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 899229268729 + 432328605289 = 948277^2 + 657517^2 .

It is an unprimeable number.

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, 332889468503 + ... + 332889468506.

Almost surely, 2^{1331557874018} is an apocalyptic number.

1331557874018 is a deficient number, since it is larger than the sum of its proper divisors (665778937012).

1331557874018 is an equidigital number, since it uses as much as digits as its factorization.

1331557874018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665778937011.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The spelling of 1331557874018 in words is "one trillion, three hundred thirty-one billion, five hundred fifty-seven million, eight hundred seventy-four thousand, eighteen".