256654167220 has 36 divisors (see below), whose sum is σ = 592425699012. Its totient is φ = 93328787200.

The previous prime is 256654167199. The next prime is 256654167277. The reversal of 256654167220 is 22761456652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45784016784 + 210870150436 = 213972^2 + 459206^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53025301 + ... + 53030140.

It is an arithmetic number, because the mean of its divisors is an integer number (16456269417).

Almost surely, 2^256654167220 is an apocalyptic number.

256654167220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256654167220 is an abundant number, since it is smaller than the sum of its proper divisors (335771531792).

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

256654167220 is a wasteful number, since it uses less digits than its factorization.

256654167220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106055472 (or 106055459 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 256654167220 in words is "two hundred fifty-six billion, six hundred fifty-four million, one hundred sixty-seven thousand, two hundred twenty".