6690306557 has 8 divisors (see below), whose sum is σ = 7305206880. Its totient is φ = 6076521360.

The previous prime is 6690306551. The next prime is 6690306607. The reversal of 6690306557 is 7556030966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6690306557 - 2⁴ = 6690306541 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 (6690306551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266207 + ... + 290252.

It is an arithmetic number, because the mean of its divisors is an integer number (913150860).

Almost surely, 2^6690306557 is an apocalyptic number.

It is an amenable number.

6690306557 is a deficient number, since it is larger than the sum of its proper divisors (614900323).

6690306557 is a wasteful number, since it uses less digits than its factorization.

6690306557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557563.

The product of its (nonzero) digits is 1020600, while the sum is 47.

The square root of 6690306557 is about 81794.2941591894. The cubic root of 6690306557 is about 1884.2940323185.

The spelling of 6690306557 in words is "six billion, six hundred ninety million, three hundred six thousand, five hundred fifty-seven".