1378151558809 has 3 divisors (see below), whose sum is σ = 1378152732757. Its totient is φ = 1378150384862.

The previous prime is 1378151558789. The next prime is 1378151558843. The reversal of 1378151558809 is 9088551518731.

It is a happy number.

The square root of 1378151558809 is 1173947.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1378151558809 - 2³⁹ = 828395744921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378151558309) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 586974 + ... + 1760920.

Almost surely, 2^{1378151558809} is an apocalyptic number.

1378151558809 is the 1173947-th square number.

1378151558809 is the 586974-th centered octagonal number.

It is an amenable number.

1378151558809 is a deficient number, since it is larger than the sum of its proper divisors (1173948).

1378151558809 is an frugal number, since it uses more digits than its factorization.

1378151558809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347894 (or 1173947 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 61.

The spelling of 1378151558809 in words is "one trillion, three hundred seventy-eight billion, one hundred fifty-one million, five hundred fifty-eight thousand, eight hundred nine".