2658128987 has 2 divisors, whose sum is σ = 2658128988. Its totient is φ = 2658128986.

The previous prime is 2658128971. The next prime is 2658129011. The reversal of 2658128987 is 7898218562.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2658128987 - 2⁴ = 2658128971 is a prime.

It is not a weakly prime, because it can be changed into another prime (2658128917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329064493 + 1329064494.

It is an arithmetic number, because the mean of its divisors is an integer number (1329064494).

Almost surely, 2^2658128987 is an apocalyptic number.

2658128987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2658128987 is an equidigital number, since it uses as much as digits as its factorization.

2658128987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 56.

The square root of 2658128987 is about 51557.0459491232. The cubic root of 2658128987 is about 1385.2410423829.

The spelling of 2658128987 in words is "two billion, six hundred fifty-eight million, one hundred twenty-eight thousand, nine hundred eighty-seven".