6664720587 has 8 divisors (see below), whose sum is σ = 10155764736. Its totient is φ = 3808411752.

The previous prime is 6664720577. The next prime is 6664720591. The reversal of 6664720587 is 7850274666.

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

It is not a de Polignac number, because 6664720587 - 2⁸ = 6664720331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6664720537) 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, 158683803 + ... + 158683844.

It is an arithmetic number, because the mean of its divisors is an integer number (1269470592).

Almost surely, 2^6664720587 is an apocalyptic number.

6664720587 is a deficient number, since it is larger than the sum of its proper divisors (3491044149).

6664720587 is a wasteful number, since it uses less digits than its factorization.

6664720587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317367657.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The square root of 6664720587 is about 81637.7399674930. The cubic root of 6664720587 is about 1881.8889068314. Note that the first 3 decimals are identical.

The spelling of 6664720587 in words is "six billion, six hundred sixty-four million, seven hundred twenty thousand, five hundred eighty-seven".