6640346145 has 8 divisors (see below), whose sum is σ = 10624553856. Its totient is φ = 3541517936.

The previous prime is 6640346143. The next prime is 6640346161. The reversal of 6640346145 is 5416430466.

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

It is a cyclic number.

It is not a de Polignac number, because 6640346145 - 2¹ = 6640346143 is a prime.

It is a super-2 number, since 2×6640346145² = 88188393850832722050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6640346143) 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, 221344857 + ... + 221344886.

It is an arithmetic number, because the mean of its divisors is an integer number (1328069232).

Almost surely, 2^6640346145 is an apocalyptic number.

It is an amenable number.

6640346145 is a deficient number, since it is larger than the sum of its proper divisors (3984207711).

6640346145 is a wasteful number, since it uses less digits than its factorization.

6640346145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442689751.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 6640346145 is about 81488.3190708951. The cubic root of 6640346145 is about 1879.5919350679.

The spelling of 6640346145 in words is "six billion, six hundred forty million, three hundred forty-six thousand, one hundred forty-five".