664647051 has 8 divisors (see below), whose sum is σ = 886319824. Its totient is φ = 443036160.

The previous prime is 664647047. The next prime is 664647121. The reversal of 664647051 is 150746466.

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

It is not a de Polignac number, because 664647051 - 2² = 664647047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664647041) 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, 23931 + ... + 43611.

It is an arithmetic number, because the mean of its divisors is an integer number (110789978).

Almost surely, 2^664647051 is an apocalyptic number.

664647051 is a deficient number, since it is larger than the sum of its proper divisors (221672773).

664647051 is a wasteful number, since it uses less digits than its factorization.

664647051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30941.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 664647051 is about 25780.7496205987. The cubic root of 664647051 is about 872.6974240373.

The spelling of 664647051 in words is "six hundred sixty-four million, six hundred forty-seven thousand, fifty-one".