13640340651 has 32 divisors (see below), whose sum is σ = 21223910400. Its totient is φ = 7789174848.

The previous prime is 13640340629. The next prime is 13640340661. The reversal of 13640340651 is 15604304631.

It is not a de Polignac number, because 13640340651 - 2⁷ = 13640340523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13640340661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1896975 + ... + 1904151.

It is an arithmetic number, because the mean of its divisors is an integer number (663247200).

Almost surely, 2^13640340651 is an apocalyptic number.

13640340651 is a deficient number, since it is larger than the sum of its proper divisors (7583569749).

13640340651 is an equidigital number, since it uses as much as digits as its factorization.

13640340651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9048 (or 9034 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 13640340651 in words is "thirteen billion, six hundred forty million, three hundred forty thousand, six hundred fifty-one".