256621051640470 has 32 divisors (see below), whose sum is σ = 503918352001440. Its totient is φ = 93315278768640.

The previous prime is 256621051640461. The next prime is 256621051640507. The reversal of 256621051640470 is 74046150126652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11301187 + ... + 25317166.

It is an arithmetic number, because the mean of its divisors is an integer number (15747448500045).

Almost surely, 2^{256621051640470} is an apocalyptic number.

256621051640470 is a deficient number, since it is larger than the sum of its proper divisors (247297300360970).

256621051640470 is a wasteful number, since it uses less digits than its factorization.

256621051640470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36682080.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 256621051640470 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, fifty-one million, six hundred forty thousand, four hundred seventy".