12640251547 has 32 divisors (see below), whose sum is σ = 16412544000. Its totient is φ = 9445833600.

The previous prime is 12640251541. The next prime is 12640251551. The reversal of 12640251547 is 74515204621.

It is not a de Polignac number, because 12640251547 - 2³ = 12640251539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640251541) 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, 313722 + ... + 351712.

It is an arithmetic number, because the mean of its divisors is an integer number (512892000).

Almost surely, 2^12640251547 is an apocalyptic number.

12640251547 is a deficient number, since it is larger than the sum of its proper divisors (3772292453).

12640251547 is a wasteful number, since it uses less digits than its factorization.

12640251547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38187.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 12640251547 in words is "twelve billion, six hundred forty million, two hundred fifty-one thousand, five hundred forty-seven".