78042846661 has 8 divisors (see below), whose sum is σ = 84059419640. Its totient is φ = 72028170432.

The previous prime is 78042846659. The next prime is 78042846701. The reversal of 78042846661 is 16664824087.

It can be written as a sum of positive squares in 4 ways, for example, as 35032234561 + 43010612100 = 187169^2 + 207390^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78042846661 - 2¹ = 78042846659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78042846599 and 78042846608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78042886661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388146 + ... + 553843.

It is an arithmetic number, because the mean of its divisors is an integer number (10507427455).

Almost surely, 2^78042846661 is an apocalyptic number.

It is an amenable number.

78042846661 is a deficient number, since it is larger than the sum of its proper divisors (6016572979).

78042846661 is a wasteful number, since it uses less digits than its factorization.

78042846661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948375.

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 78042846661 in words is "seventy-eight billion, forty-two million, eight hundred forty-six thousand, six hundred sixty-one".