257978798045 has 6 divisors (see below), whose sum is σ = 309575920542. Its totient is φ = 206382129848.

The previous prime is 257978797981. The next prime is 257978798047. The reversal of 257978798045 is 540897879752.

It can be written as a sum of positive squares in only one way, i.e., 206383038436 + 51595759609 = 454294^2 + 227147^2 .

It is not a de Polignac number, because 257978798045 - 2⁶ = 257978797981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257978798045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257978798047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022162 + ... + 1249308.

It is an arithmetic number, because the mean of its divisors is an integer number (51595986757).

Almost surely, 2^257978798045 is an apocalyptic number.

It is an amenable number.

257978798045 is a deficient number, since it is larger than the sum of its proper divisors (51597122497).

257978798045 is an frugal number, since it uses more digits than its factorization.

257978798045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454299 (or 227152 counting only the distinct ones).

The product of its (nonzero) digits is 355622400, while the sum is 71.

The spelling of 257978798045 in words is "two hundred fifty-seven billion, nine hundred seventy-eight million, seven hundred ninety-eight thousand, forty-five".