257218143020 has 24 divisors (see below), whose sum is σ = 541714766544. Its totient is φ = 102590749376.

The previous prime is 257218142989. The next prime is 257218143023. The reversal of 257218143020 is 20341812752.

It is a super-2 number, since 2×257218143020² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257218143023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18524627 + ... + 18538506.

It is an arithmetic number, because the mean of its divisors is an integer number (22571448606).

Almost surely, 2^257218143020 is an apocalyptic number.

257218143020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257218143020 is an abundant number, since it is smaller than the sum of its proper divisors (284496623524).

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

257218143020 is a wasteful number, since it uses less digits than its factorization.

257218143020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37063489 (or 37063487 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

Adding to 257218143020 its reverse (20341812752), we get a palindrome (277559955772).

The spelling of 257218143020 in words is "two hundred fifty-seven billion, two hundred eighteen million, one hundred forty-three thousand, twenty".