12749361540 has 48 divisors (see below), whose sum is σ = 36528410688. Its totient is φ = 3320763264.

The previous prime is 12749361539. The next prime is 12749361571. The reversal of 12749361540 is 4516394721.

It is a junction number, because it is equal to n+sod(n) for n = 12749361492 and 12749361501.

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, 2468227 + ... + 2473386.

It is an arithmetic number, because the mean of its divisors is an integer number (761008556).

Almost surely, 2^12749361540 is an apocalyptic number.

12749361540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12749361540 is an abundant number, since it is smaller than the sum of its proper divisors (23779049148).

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

12749361540 is a wasteful number, since it uses less digits than its factorization.

12749361540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941668 (or 4941666 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 12749361540 in words is "twelve billion, seven hundred forty-nine million, three hundred sixty-one thousand, five hundred forty".