9999978707 has 2 divisors, whose sum is σ = 9999978708. Its totient is φ = 9999978706.

The previous prime is 9999978701. The next prime is 9999978713. The reversal of 9999978707 is 7078799999.

It is a balanced prime because it is at equal distance from previous prime (9999978701) and next prime (9999978713).

It is a cyclic number.

It is not a de Polignac number, because 9999978707 - 2⁶ = 9999978643 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999978701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999989353 + 4999989354.

It is an arithmetic number, because the mean of its divisors is an integer number (4999989354).

Almost surely, 2^9999978707 is an apocalyptic number.

9999978707 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999978707 is an equidigital number, since it uses as much as digits as its factorization.

9999978707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162030456, while the sum is 74.

The square root of 9999978707 is about 99999.8935349433. The cubic root of 9999978707 is about 2154.4331608849.

The spelling of 9999978707 in words is "nine billion, nine hundred ninety-nine million, nine hundred seventy-eight thousand, seven hundred seven".