664540167765 has 8 divisors (see below), whose sum is σ = 1063264268448. Its totient is φ = 354421422800.

The previous prime is 664540167763. The next prime is 664540167787. The reversal of 664540167765 is 567761045466.

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

It is not a de Polignac number, because 664540167765 - 2¹ = 664540167763 is a prime.

It is a super-2 number, since 2×664540167765² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664540167761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22151338911 + ... + 22151338940.

It is an arithmetic number, because the mean of its divisors is an integer number (132908033556).

Almost surely, 2^664540167765 is an apocalyptic number.

It is an amenable number.

664540167765 is a deficient number, since it is larger than the sum of its proper divisors (398724100683).

664540167765 is a wasteful number, since it uses less digits than its factorization.

664540167765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44302677859.

The product of its (nonzero) digits is 25401600, while the sum is 57.

The spelling of 664540167765 in words is "six hundred sixty-four billion, five hundred forty million, one hundred sixty-seven thousand, seven hundred sixty-five".