9978901967 has 2 divisors, whose sum is σ = 9978901968. Its totient is φ = 9978901966.

The previous prime is 9978901963. The next prime is 9978902033. The reversal of 9978901967 is 7691098799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9978901967 - 2² = 9978901963 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9978901963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989450983 + 4989450984.

It is an arithmetic number, because the mean of its divisors is an integer number (4989450984).

Almost surely, 2^9978901967 is an apocalyptic number.

9978901967 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978901967 is an equidigital number, since it uses as much as digits as its factorization.

9978901967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15431472, while the sum is 65.

The square root of 9978901967 is about 99894.4541353523. The cubic root of 9978901967 is about 2152.9184787560.

The spelling of 9978901967 in words is "nine billion, nine hundred seventy-eight million, nine hundred one thousand, nine hundred sixty-seven".