12126650640 has 320 divisors, whose sum is σ = 42453282816. Its totient is φ = 2841163776.

The previous prime is 12126650629. The next prime is 12126650651. The reversal of 12126650640 is 4605662121.

It is an interprime number because it is at equal distance from previous prime (12126650629) and next prime (12126650651).

It is a super-2 number, since 2×12126650640² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24900477 + ... + 24900963.

Almost surely, 2^12126650640 is an apocalyptic number.

12126650640 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 12126650640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21226641408).

12126650640 is an abundant number, since it is smaller than the sum of its proper divisors (30326632176).

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

12126650640 is a wasteful number, since it uses less digits than its factorization.

12126650640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 12126650640 in words is "twelve billion, one hundred twenty-six million, six hundred fifty thousand, six hundred forty".