1278373442385 has 32 divisors (see below), whose sum is σ = 2204708163840. Its totient is φ = 628789540608.

The previous prime is 1278373442363. The next prime is 1278373442399. The reversal of 1278373442385 is 5832443738721.

It is a happy number.

It is not a de Polignac number, because 1278373442385 - 2¹⁰ = 1278373441361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2716725 + ... + 3152354.

It is an arithmetic number, because the mean of its divisors is an integer number (68897130120).

Almost surely, 2^{1278373442385} is an apocalyptic number.

1278373442385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278373442385 is a deficient number, since it is larger than the sum of its proper divisors (926334721455).

1278373442385 is a wasteful number, since it uses less digits than its factorization.

1278373442385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5870217.

The product of its digits is 27095040, while the sum is 57.

The spelling of 1278373442385 in words is "one trillion, two hundred seventy-eight billion, three hundred seventy-three million, four hundred forty-two thousand, three hundred eighty-five".