7800861685444 has 6 divisors (see below), whose sum is σ = 13651507949534. Its totient is φ = 3900430842720.

The previous prime is 7800861685367. The next prime is 7800861685451. The reversal of 7800861685444 is 4445861680087.

It can be written as a sum of positive squares in only one way, i.e., 4866965454400 + 2933896231044 = 2206120^2 + 1712862^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975107710677 + ... + 975107710684.

Almost surely, 2^{7800861685444} is an apocalyptic number.

It is an amenable number.

7800861685444 is a deficient number, since it is larger than the sum of its proper divisors (5850646264090).

7800861685444 is a wasteful number, since it uses less digits than its factorization.

7800861685444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950215421365 (or 1950215421363 counting only the distinct ones).

The product of its (nonzero) digits is 41287680, while the sum is 61.

The spelling of 7800861685444 in words is "seven trillion, eight hundred billion, eight hundred sixty-one million, six hundred eighty-five thousand, four hundred forty-four".