1078661873885 has 4 divisors (see below), whose sum is σ = 1294394248668. Its totient is φ = 862929499104.

The previous prime is 1078661873873. The next prime is 1078661873917. The reversal of 1078661873885 is 5883781668701.

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

It can be written as a sum of positive squares in 2 ways, for example, as 146637682489 + 932024191396 = 382933^2 + 965414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078661873885 - 2¹⁴ = 1078661857501 is a prime.

It is a super-2 number, since 2×1078661873885² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

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, 107866187384 + ... + 107866187393.

It is an arithmetic number, because the mean of its divisors is an integer number (323598562167).

Almost surely, 2^{1078661873885} is an apocalyptic number.

It is an amenable number.

1078661873885 is a deficient number, since it is larger than the sum of its proper divisors (215732374783).

1078661873885 is an equidigital number, since it uses as much as digits as its factorization.

1078661873885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215732374782.

The product of its (nonzero) digits is 108380160, while the sum is 68.

The spelling of 1078661873885 in words is "one trillion, seventy-eight billion, six hundred sixty-one million, eight hundred seventy-three thousand, eight hundred eighty-five".