2656003991 has 2 divisors, whose sum is σ = 2656003992. Its totient is φ = 2656003990.

The previous prime is 2656003927. The next prime is 2656004083. The reversal of 2656003991 is 1993006562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2656003991 - 2⁶ = 2656003927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2656003391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328001995 + 1328001996.

It is an arithmetic number, because the mean of its divisors is an integer number (1328001996).

Almost surely, 2^2656003991 is an apocalyptic number.

2656003991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656003991 is an equidigital number, since it uses as much as digits as its factorization.

2656003991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 2656003991 is about 51536.4336270953. The cubic root of 2656003991 is about 1384.8718081772.

The spelling of 2656003991 in words is "two billion, six hundred fifty-six million, three thousand, nine hundred ninety-one".