6660375553 has 4 divisors (see below), whose sum is σ = 7172712148. Its totient is φ = 6148038960.

The previous prime is 6660375541. The next prime is 6660375563. The reversal of 6660375553 is 3555730666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3555730666 = 2 ⋅1777865333.

It can be written as a sum of positive squares in 2 ways, for example, as 3350904769 + 3309470784 = 57887^2 + 57528^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660375553 - 2⁵ = 6660375521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660375523) 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, 256168278 + ... + 256168303.

It is an arithmetic number, because the mean of its divisors is an integer number (1793178037).

Almost surely, 2^6660375553 is an apocalyptic number.

It is an amenable number.

6660375553 is a deficient number, since it is larger than the sum of its proper divisors (512336595).

6660375553 is a wasteful number, since it uses less digits than its factorization.

6660375553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512336594.

The product of its (nonzero) digits is 1701000, while the sum is 46.

The square root of 6660375553 is about 81611.1239537846. The cubic root of 6660375553 is about 1881.4798549800.

The spelling of 6660375553 in words is "six billion, six hundred sixty million, three hundred seventy-five thousand, five hundred fifty-three".