6645420502164 has 36 divisors (see below), whose sum is σ = 16804736594100. Its totient is φ = 2214271113600.

The previous prime is 6645420502159. The next prime is 6645420502169. The reversal of 6645420502164 is 4612050245466.

6645420502164 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 420 + 5 + 0 + 216 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (6645420502159) and next prime (6645420502169).

It can be written as a sum of positive squares in 2 ways, for example, as 4614367979664 + 2031052522500 = 2148108^2 + 1425150^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×6645420502164² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645420502169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36117537 + ... + 36301064.

It is an arithmetic number, because the mean of its divisors is an integer number (466798238725).

Almost surely, 2^{6645420502164} is an apocalyptic number.

It is an amenable number.

6645420502164 is an abundant number, since it is smaller than the sum of its proper divisors (10159316091936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6645420502164 is a wasteful number, since it uses less digits than its factorization.

6645420502164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72421160 (or 72421155 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 6645420502164 in words is "six trillion, six hundred forty-five billion, four hundred twenty million, five hundred two thousand, one hundred sixty-four".