1213387805637 has 12 divisors (see below), whose sum is σ = 2003052885600. Its totient is φ = 693364460328.

The previous prime is 1213387805599. The next prime is 1213387805659. The reversal of 1213387805637 is 7365087833121.

It is a happy number.

1213387805637 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 3 + 8 + 78 + 0 + 563 + 7 = 666.

It is not a de Polignac number, because 1213387805637 - 2²⁸ = 1213119370181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213387805237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9630061887 + ... + 9630062012.

It is an arithmetic number, because the mean of its divisors is an integer number (166921073800).

Almost surely, 2^{1213387805637} is an apocalyptic number.

It is an amenable number.

1213387805637 is a deficient number, since it is larger than the sum of its proper divisors (789665079963).

1213387805637 is a wasteful number, since it uses less digits than its factorization.

1213387805637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19260123912 (or 19260123909 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 1213387805637 in words is "one trillion, two hundred thirteen billion, three hundred eighty-seven million, eight hundred five thousand, six hundred thirty-seven".