6537275644 has 6 divisors (see below), whose sum is σ = 11440232384. Its totient is φ = 3268637820.

The previous prime is 6537275623. The next prime is 6537275663. The reversal of 6537275644 is 4465727356.

It is a super-2 number, since 2×6537275644² = 85471945691271229472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817159452 + ... + 817159459.

Almost surely, 2^6537275644 is an apocalyptic number.

It is an amenable number.

6537275644 is a deficient number, since it is larger than the sum of its proper divisors (4902956740).

6537275644 is a wasteful number, since it uses less digits than its factorization.

6537275644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634318915 (or 1634318913 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 49.

The square root of 6537275644 is about 80853.4207315930. The cubic root of 6537275644 is about 1869.8162615091.

The spelling of 6537275644 in words is "six billion, five hundred thirty-seven million, two hundred seventy-five thousand, six hundred forty-four".