6651877745 has 4 divisors (see below), whose sum is σ = 7982253300. Its totient is φ = 5321502192.

The previous prime is 6651877703. The next prime is 6651877747. The reversal of 6651877745 is 5477781566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5477781566 = 2 ⋅2738890783.

It can be written as a sum of positive squares in 2 ways, for example, as 2999971984 + 3651905761 = 54772^2 + 60431^2 .

It is a cyclic number.

It is not a de Polignac number, because 6651877745 - 2⁸ = 6651877489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6651877747) 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, 665187770 + ... + 665187779.

It is an arithmetic number, because the mean of its divisors is an integer number (1995563325).

Almost surely, 2^6651877745 is an apocalyptic number.

It is an amenable number.

6651877745 is a deficient number, since it is larger than the sum of its proper divisors (1330375555).

6651877745 is a wasteful number, since it uses less digits than its factorization.

6651877745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330375554.

The product of its digits is 9878400, while the sum is 56.

The square root of 6651877745 is about 81559.0445321670. The cubic root of 6651877745 is about 1880.6793365999.

The spelling of 6651877745 in words is "six billion, six hundred fifty-one million, eight hundred seventy-seven thousand, seven hundred forty-five".