6581451957 has 4 divisors (see below), whose sum is σ = 8775269280. Its totient is φ = 4387634636.

The previous prime is 6581451941. The next prime is 6581451973. The reversal of 6581451957 is 7591541856.

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 (6581451941) and next prime (6581451973).

It is a cyclic number.

It is not a de Polignac number, because 6581451957 - 2⁴ = 6581451941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6581451907) 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, 1096908657 + ... + 1096908662.

It is an arithmetic number, because the mean of its divisors is an integer number (2193817320).

Almost surely, 2^6581451957 is an apocalyptic number.

It is an amenable number.

6581451957 is a deficient number, since it is larger than the sum of its proper divisors (2193817323).

6581451957 is a wasteful number, since it uses less digits than its factorization.

6581451957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193817322.

The product of its digits is 1512000, while the sum is 51.

The square root of 6581451957 is about 81126.1484171411. The cubic root of 6581451957 is about 1874.0186349639.

The spelling of 6581451957 in words is "six billion, five hundred eighty-one million, four hundred fifty-one thousand, nine hundred fifty-seven".