6640564151425 has 12 divisors (see below), whose sum is σ = 8234751233980. Its totient is φ = 5312159910720.

The previous prime is 6640564151411. The next prime is 6640564151453. The reversal of 6640564151425 is 5241514650466.

It can be written as a sum of positive squares in 6 ways, for example, as 3034727750209 + 3605836401216 = 1742047^2 + 1898904^2 .

It is not a de Polignac number, because 6640564151425 - 2⁷ = 6640564151297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6819810 + ... + 7732459.

Almost surely, 2^{6640564151425} is an apocalyptic number.

It is an amenable number.

6640564151425 is a deficient number, since it is larger than the sum of its proper divisors (1594187082555).

6640564151425 is a wasteful number, since it uses less digits than its factorization.

6640564151425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14570532 (or 14570527 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 49.

The spelling of 6640564151425 in words is "six trillion, six hundred forty billion, five hundred sixty-four million, one hundred fifty-one thousand, four hundred twenty-five".