12505551616 has 36 divisors (see below), whose sum is σ = 24986992464. Its totient is φ = 6246579200.

The previous prime is 12505551581. The next prime is 12505551659. The reversal of 12505551616 is 61615550521.

It is a super-2 number, since 2×12505551616² (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 3 ways as a sum of consecutive naturals, for example, 240246 + ... + 287626.

It is an arithmetic number, because the mean of its divisors is an integer number (694083124).

Almost surely, 2^12505551616 is an apocalyptic number.

12505551616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12505551616 is a deficient number, since it is larger than the sum of its proper divisors (12481440848).

12505551616 is an equidigital number, since it uses as much as digits as its factorization.

12505551616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48428 (or 48414 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 37.

It can be divided in two parts, 125055 and 51616, that added together give a palindrome (176671).

The spelling of 12505551616 in words is "twelve billion, five hundred five million, five hundred fifty-one thousand, six hundred sixteen".