1278161856862 has 8 divisors (see below), whose sum is σ = 2091537583992. Its totient is φ = 580982662200.

The previous prime is 1278161856859. The next prime is 1278161856883. The reversal of 1278161856862 is 2686581618721.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1278161856862.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29049133089 + ... + 29049133132.

It is an arithmetic number, because the mean of its divisors is an integer number (261442197999).

Almost surely, 2^{1278161856862} is an apocalyptic number.

1278161856862 is a deficient number, since it is larger than the sum of its proper divisors (813375727130).

1278161856862 is a wasteful number, since it uses less digits than its factorization.

1278161856862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58098266234.

The product of its digits is 15482880, while the sum is 61.

The spelling of 1278161856862 in words is "one trillion, two hundred seventy-eight billion, one hundred sixty-one million, eight hundred fifty-six thousand, eight hundred sixty-two".