256439947202 has 4 divisors (see below), whose sum is σ = 384659920806. Its totient is φ = 128219973600.

The previous prime is 256439947193. The next prime is 256439947271. The reversal of 256439947202 is 202749934652.

256439947202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 506399²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 256439947201 + 1 = 506399^2 + 1^2 .

It is a super-2 number, since 2×256439947202² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64109986799 + ... + 64109986802.

Almost surely, 2^256439947202 is an apocalyptic number.

256439947202 is a deficient number, since it is larger than the sum of its proper divisors (128219973604).

256439947202 is a wasteful number, since it uses less digits than its factorization.

256439947202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128219973603.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 256439947202 in words is "two hundred fifty-six billion, four hundred thirty-nine million, nine hundred forty-seven thousand, two hundred two".