256603400545 has 8 divisors (see below), whose sum is σ = 307930429224. Its totient is φ = 205278488064.

The previous prime is 256603400531. The next prime is 256603400609. The reversal of 256603400545 is 545004306652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 86681369889 + 169922030656 = 294417^2 + 412216^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 256603400545 - 2¹⁵ = 256603367777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256603400498 and 256603400507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248784 + ... + 758353.

It is an arithmetic number, because the mean of its divisors is an integer number (38491303653).

Almost surely, 2^256603400545 is an apocalyptic number.

It is an amenable number.

256603400545 is a deficient number, since it is larger than the sum of its proper divisors (51327028679).

256603400545 is a wasteful number, since it uses less digits than its factorization.

256603400545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058099.

The product of its (nonzero) digits is 432000, while the sum is 40.

The spelling of 256603400545 in words is "two hundred fifty-six billion, six hundred three million, four hundred thousand, five hundred forty-five".