6445163544 has 16 divisors (see below), whose sum is σ = 16112908920. Its totient is φ = 2148387840.

The previous prime is 6445163507. The next prime is 6445163581. The reversal of 6445163544 is 4453615446.

It is an interprime number because it is at equal distance from previous prime (6445163507) and next prime (6445163581).

It is a junction number, because it is equal to n+sod(n) for n = 6445163496 and 6445163505.

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, 134274217 + ... + 134274264.

Almost surely, 2^6445163544 is an apocalyptic number.

It is an amenable number.

6445163544 is an abundant number, since it is smaller than the sum of its proper divisors (9667745376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445163544 is a wasteful number, since it uses less digits than its factorization.

6445163544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268548490 (or 268548486 counting only the distinct ones).

The product of its digits is 691200, while the sum is 42.

The square root of 6445163544 is about 80281.7759145872. The cubic root of 6445163544 is about 1860.9926046603.

The spelling of 6445163544 in words is "six billion, four hundred forty-five million, one hundred sixty-three thousand, five hundred forty-four".