256067551 has 2 divisors, whose sum is σ = 256067552. Its totient is φ = 256067550.

The previous prime is 256067543. The next prime is 256067557. The reversal of 256067551 is 155760652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256067551 - 2³ = 256067543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256067551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256067557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128033775 + 128033776.

It is an arithmetic number, because the mean of its divisors is an integer number (128033776).

Almost surely, 2^256067551 is an apocalyptic number.

256067551 is a deficient number, since it is larger than the sum of its proper divisors (1).

256067551 is an equidigital number, since it uses as much as digits as its factorization.

256067551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 256067551 is about 16002.1108295125. The cubic root of 256067551 is about 635.0162651092.

The spelling of 256067551 in words is "two hundred fifty-six million, sixty-seven thousand, five hundred fifty-one".