12961597500 has 180 divisors, whose sum is σ = 41897207352. Its totient is φ = 3375792000.

The previous prime is 12961597499. The next prime is 12961597511. The reversal of 12961597500 is 579516921.

12961597500 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 1 + 597 + 50 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 960802 + ... + 974198.

Almost surely, 2^12961597500 is an apocalyptic number.

12961597500 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 12961597500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20948603676).

12961597500 is an abundant number, since it is smaller than the sum of its proper divisors (28935609852).

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

12961597500 is a wasteful number, since it uses less digits than its factorization.

12961597500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13470 (or 13450 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 45.

The spelling of 12961597500 in words is "twelve billion, nine hundred sixty-one million, five hundred ninety-seven thousand, five hundred".