12651551616 has 64 divisors (see below), whose sum is σ = 36660758400. Its totient is φ = 3833802240.

The previous prime is 12651551609. The next prime is 12651551621. The reversal of 12651551616 is 61615515621.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×12651551616² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493356 + ... + 1501803.

It is an arithmetic number, because the mean of its divisors is an integer number (572824350).

Almost surely, 2^12651551616 is an apocalyptic number.

12651551616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12651551616 is an abundant number, since it is smaller than the sum of its proper divisors (24009206784).

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

12651551616 is a wasteful number, since it uses less digits than its factorization.

12651551616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995187 (or 2995175 counting only the distinct ones).

The product of its digits is 54000, while the sum is 39.

The spelling of 12651551616 in words is "twelve billion, six hundred fifty-one million, five hundred fifty-one thousand, six hundred sixteen".