6463781957 has 16 divisors (see below), whose sum is σ = 6756108480. Its totient is φ = 6176352000.

The previous prime is 6463781911. The next prime is 6463782001. The reversal of 6463781957 is 7591873646.

It is a cyclic number.

It is not a de Polignac number, because 6463781957 - 2¹⁰ = 6463780933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6463786957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1521278 + ... + 1525520.

It is an arithmetic number, because the mean of its divisors is an integer number (422256780).

Almost surely, 2^6463781957 is an apocalyptic number.

It is an amenable number.

6463781957 is a deficient number, since it is larger than the sum of its proper divisors (292326523).

6463781957 is a wasteful number, since it uses less digits than its factorization.

6463781957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804.

The product of its digits is 7620480, while the sum is 56.

The square root of 6463781957 is about 80397.6489519439. The cubic root of 6463781957 is about 1862.7828575823.

The spelling of 6463781957 in words is "six billion, four hundred sixty-three million, seven hundred eighty-one thousand, nine hundred fifty-seven".