258394954778 has 48 divisors (see below), whose sum is σ = 411315408000. Its totient is φ = 121726281600.

The previous prime is 258394954717. The next prime is 258394954793. The reversal of 258394954778 is 877459493852.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172377473 + ... + 172378971.

It is an arithmetic number, because the mean of its divisors is an integer number (8569071000).

Almost surely, 2^258394954778 is an apocalyptic number.

258394954778 is a deficient number, since it is larger than the sum of its proper divisors (152920453222).

258394954778 is a wasteful number, since it uses less digits than its factorization.

258394954778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691 (or 2672 counting only the distinct ones).

The product of its digits is 609638400, while the sum is 71.

The spelling of 258394954778 in words is "two hundred fifty-eight billion, three hundred ninety-four million, nine hundred fifty-four thousand, seven hundred seventy-eight".