6403440625594 has 4 divisors (see below), whose sum is σ = 9605160938394. Its totient is φ = 3201720312796.

The previous prime is 6403440625583. The next prime is 6403440625601. The reversal of 6403440625594 is 4955260443046.

It is a happy number.

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., 4419610630369 + 1983829995225 = 2102287^2 + 1408485^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600860156397 + ... + 1600860156400.

Almost surely, 2^{6403440625594} is an apocalyptic number.

6403440625594 is a deficient number, since it is larger than the sum of its proper divisors (3201720312800).

6403440625594 is a wasteful number, since it uses less digits than its factorization.

6403440625594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201720312799.

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 6403440625594 in words is "six trillion, four hundred three billion, four hundred forty million, six hundred twenty-five thousand, five hundred ninety-four".