6657997497 has 8 divisors (see below), whose sum is σ = 8881539744. Its totient is φ = 4436560128.

The previous prime is 6657997457. The next prime is 6657997501. The reversal of 6657997497 is 7947997566.

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

It is not a de Polignac number, because 6657997497 - 2⁶ = 6657997433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6657997417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518823 + ... + 531500.

It is an arithmetic number, because the mean of its divisors is an integer number (1110192468).

Almost surely, 2^6657997497 is an apocalyptic number.

It is an amenable number.

6657997497 is a deficient number, since it is larger than the sum of its proper divisors (2223542247).

6657997497 is a wasteful number, since it uses less digits than its factorization.

6657997497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052439.

The product of its digits is 180033840, while the sum is 69.

The square root of 6657997497 is about 81596.5532176452. The cubic root of 6657997497 is about 1881.2559037912.

Adding to 6657997497 its sum of digits (69), we get a palindrome (6657997566).

The spelling of 6657997497 in words is "six billion, six hundred fifty-seven million, nine hundred ninety-seven thousand, four hundred ninety-seven".