6556745757 has 4 divisors (see below), whose sum is σ = 8742327680. Its totient is φ = 4371163836.

The previous prime is 6556745753. The next prime is 6556745761. The reversal of 6556745757 is 7575476556.

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 (6556745753) and next prime (6556745761).

It is not a de Polignac number, because 6556745757 - 2² = 6556745753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6556745697 and 6556745706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6556745753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092790957 + ... + 1092790962.

It is an arithmetic number, because the mean of its divisors is an integer number (2185581920).

Almost surely, 2^6556745757 is an apocalyptic number.

It is an amenable number.

6556745757 is a deficient number, since it is larger than the sum of its proper divisors (2185581923).

6556745757 is a wasteful number, since it uses less digits than its factorization.

6556745757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185581922.

The product of its digits is 30870000, while the sum is 57.

The square root of 6556745757 is about 80973.7349824003. The cubic root of 6556745757 is about 1871.6707267377.

The spelling of 6556745757 in words is "six billion, five hundred fifty-six million, seven hundred forty-five thousand, seven hundred fifty-seven".