12640277500 has 60 divisors (see below), whose sum is σ = 27975251304. Its totient is φ = 4995112000.

The previous prime is 12640277479. The next prime is 12640277513. The reversal of 12640277500 is 577204621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 177042 + ... + 237958.

Almost surely, 2^12640277500 is an apocalyptic number.

12640277500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12640277500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13987625652).

12640277500 is an abundant number, since it is smaller than the sum of its proper divisors (15334973804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640277500 is an equidigital number, since it uses as much as digits as its factorization.

12640277500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61024 (or 61007 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 12640277500 in words is "twelve billion, six hundred forty million, two hundred seventy-seven thousand, five hundred".