1326640851 has 24 divisors (see below), whose sum is σ = 2012864256. Its totient is φ = 840351600.

The previous prime is 1326640837. The next prime is 1326640867. The reversal of 1326640851 is 1580466231.

It is a happy number.

1326640851 is a `hidden beast` number, since 1 + 3 + 2 + 6 + 640 + 8 + 5 + 1 = 666.

It is not a de Polignac number, because 1326640851 - 2¹⁸ = 1326378707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1326640811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10036 + ... + 52478.

It is an arithmetic number, because the mean of its divisors is an integer number (83869344).

Almost surely, 2^1326640851 is an apocalyptic number.

1326640851 is a deficient number, since it is larger than the sum of its proper divisors (686223405).

1326640851 is a wasteful number, since it uses less digits than its factorization.

1326640851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42623 (or 42620 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1326640851 is about 36423.0812946955. The cubic root of 1326640851 is about 1098.7978191320.

The spelling of 1326640851 in words is "one billion, three hundred twenty-six million, six hundred forty thousand, eight hundred fifty-one".