12605511550 has 12 divisors (see below), whose sum is σ = 23446251576. Its totient is φ = 5042204600.

The previous prime is 12605511511. The next prime is 12605511553. The reversal of 12605511550 is 5511550621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12605511553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 126055066 + ... + 126055165.

It is an arithmetic number, because the mean of its divisors is an integer number (1953854298).

Almost surely, 2^12605511550 is an apocalyptic number.

12605511550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12605511550 is a deficient number, since it is larger than the sum of its proper divisors (10840740026).

12605511550 is a wasteful number, since it uses less digits than its factorization.

12605511550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252110243 (or 252110238 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 12605511550 in words is "twelve billion, six hundred five million, five hundred eleven thousand, five hundred fifty".