2558397906 has 32 divisors (see below), whose sum is σ = 5806298880. Its totient is φ = 834653808.

The previous prime is 2558397811. The next prime is 2558397979. The reversal of 2558397906 is 6097938552.

2558397906 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501481 + ... + 506556.

It is an arithmetic number, because the mean of its divisors is an integer number (181446840).

Almost surely, 2^2558397906 is an apocalyptic number.

2558397906 is an abundant number, since it is smaller than the sum of its proper divisors (3247900974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2558397906 is a wasteful number, since it uses less digits than its factorization.

2558397906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008095 (or 1008089 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The square root of 2558397906 is about 50580.6080034631. The cubic root of 2558397906 is about 1367.6953288114.

The spelling of 2558397906 in words is "two billion, five hundred fifty-eight million, three hundred ninety-seven thousand, nine hundred six".