664555160251 has 4 divisors (see below), whose sum is σ = 668226735904. Its totient is φ = 660883584600.

The previous prime is 664555160231. The next prime is 664555160263. The reversal of 664555160251 is 152061555466.

It is a happy number.

664555160251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664555160251 - 2⁹ = 664555159739 is a prime.

It is a super-2 number, since 2×664555160251² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664555160231) 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, 1835787555 + ... + 1835787916.

It is an arithmetic number, because the mean of its divisors is an integer number (167056683976).

Almost surely, 2^664555160251 is an apocalyptic number.

664555160251 is a deficient number, since it is larger than the sum of its proper divisors (3671575653).

664555160251 is a wasteful number, since it uses less digits than its factorization.

664555160251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671575652.

The product of its (nonzero) digits is 1080000, while the sum is 46.

The spelling of 664555160251 in words is "six hundred sixty-four billion, five hundred fifty-five million, one hundred sixty thousand, two hundred fifty-one".