7978855699 has 8 divisors (see below), whose sum is σ = 8059166720. Its totient is φ = 7898674176.

The previous prime is 7978855697. The next prime is 7978855739. The reversal of 7978855699 is 9965588797.

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 7978855699 - 2¹ = 7978855697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7978855697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93934 + ... + 157420.

It is an arithmetic number, because the mean of its divisors is an integer number (1007395840).

Almost surely, 2^7978855699 is an apocalyptic number.

7978855699 is a deficient number, since it is larger than the sum of its proper divisors (80311021).

7978855699 is a wasteful number, since it uses less digits than its factorization.

7978855699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64749.

The product of its digits is 342921600, while the sum is 73.

The square root of 7978855699 is about 89324.4406587581. The cubic root of 7978855699 is about 1998.2364202670.

The spelling of 7978855699 in words is "seven billion, nine hundred seventy-eight million, eight hundred fifty-five thousand, six hundred ninety-nine".