6540640376 has 8 divisors (see below), whose sum is σ = 12263700720. Its totient is φ = 3270320184.

The previous prime is 6540640373. The next prime is 6540640397. The reversal of 6540640376 is 6730460456.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×6540640376² = 85559953056322842752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540640373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408790016 + ... + 408790031.

It is an arithmetic number, because the mean of its divisors is an integer number (1532962590).

Almost surely, 2^6540640376 is an apocalyptic number.

It is an amenable number.

6540640376 is a deficient number, since it is larger than the sum of its proper divisors (5723060344).

6540640376 is a wasteful number, since it uses less digits than its factorization.

6540640376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817580053 (or 817580049 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 6540640376 is about 80874.2256593533. The cubic root of 6540640376 is about 1870.1370042701.

The spelling of 6540640376 in words is "six billion, five hundred forty million, six hundred forty thousand, three hundred seventy-six".