256421452046 has 8 divisors (see below), whose sum is σ = 385343144904. Its totient is φ = 127973737080.

The previous prime is 256421452019. The next prime is 256421452087. The reversal of 256421452046 is 640254124652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×256421452046² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256421451994 and 256421452012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118493120 + ... + 118495283.

It is an arithmetic number, because the mean of its divisors is an integer number (48167893113).

Almost surely, 2^256421452046 is an apocalyptic number.

256421452046 is a deficient number, since it is larger than the sum of its proper divisors (128921692858).

256421452046 is a wasteful number, since it uses less digits than its factorization.

256421452046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236988946.

The product of its (nonzero) digits is 460800, while the sum is 41.

Adding to 256421452046 its reverse (640254124652), we get a palindrome (896675576698).

The spelling of 256421452046 in words is "two hundred fifty-six billion, four hundred twenty-one million, four hundred fifty-two thousand, forty-six".