6403640613 has 4 divisors (see below), whose sum is σ = 8538187488. Its totient is φ = 4269093740.

The previous prime is 6403640599. The next prime is 6403640627. The reversal of 6403640613 is 3160463046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6403640599) and next prime (6403640627).

It is a cyclic number.

It is not a de Polignac number, because 6403640613 - 2⁶ = 6403640549 is a prime.

It is a super-2 number, since 2×6403640613² = 82013226200926031538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403640693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067273433 + ... + 1067273438.

It is an arithmetic number, because the mean of its divisors is an integer number (2134546872).

Almost surely, 2^6403640613 is an apocalyptic number.

It is an amenable number.

6403640613 is a deficient number, since it is larger than the sum of its proper divisors (2134546875).

6403640613 is a wasteful number, since it uses less digits than its factorization.

6403640613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134546874.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 6403640613 is about 80022.7505963148. The cubic root of 6403640613 is about 1856.9875131430.

The spelling of 6403640613 in words is "six billion, four hundred three million, six hundred forty thousand, six hundred thirteen".