257355640770 has 64 divisors (see below), whose sum is σ = 623742336000. Its totient is φ = 67954251456.

The previous prime is 257355640739. The next prime is 257355640777. The reversal of 257355640770 is 77046553752.

It is a super-2 number, since 2×257355640770² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257355640777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1499011 + ... + 1661849.

It is an arithmetic number, because the mean of its divisors is an integer number (9745974000).

Almost surely, 2^257355640770 is an apocalyptic number.

257355640770 is an abundant number, since it is smaller than the sum of its proper divisors (366386695230).

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

257355640770 is a wasteful number, since it uses less digits than its factorization.

257355640770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163367.

The product of its (nonzero) digits is 6174000, while the sum is 51.

The spelling of 257355640770 in words is "two hundred fifty-seven billion, three hundred fifty-five million, six hundred forty thousand, seven hundred seventy".