12506161620 has 48 divisors (see below), whose sum is σ = 35028241920. Its totient is φ = 3333929856.

The previous prime is 12506161609. The next prime is 12506161631. The reversal of 12506161620 is 2616160521.

It is an interprime number because it is at equal distance from previous prime (12506161609) and next prime (12506161631).

It is a super-2 number, since 2×12506161620² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170514 + ... + 232566.

It is an arithmetic number, because the mean of its divisors is an integer number (729755040).

Almost surely, 2^12506161620 is an apocalyptic number.

12506161620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12506161620 is an abundant number, since it is smaller than the sum of its proper divisors (22522080300).

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

12506161620 is a wasteful number, since it uses less digits than its factorization.

12506161620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65424 (or 65422 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

It can be divided in two parts, 125061 and 61620, that added together give a palindrome (186681).

The spelling of 12506161620 in words is "twelve billion, five hundred six million, one hundred sixty-one thousand, six hundred twenty".