1213587633646 has 32 divisors (see below), whose sum is σ = 1852371037440. Its totient is φ = 596233430016.

The previous prime is 1213587633617. The next prime is 1213587633679. The reversal of 1213587633646 is 6463367853121.

It is a super-2 number, since 2×1213587633646² (a number of 25 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 15 ways as a sum of consecutive naturals, for example, 18273276 + ... + 18339568.

It is an arithmetic number, because the mean of its divisors is an integer number (57886594920).

Almost surely, 2^{1213587633646} is an apocalyptic number.

1213587633646 is a deficient number, since it is larger than the sum of its proper divisors (638783403794).

1213587633646 is a wasteful number, since it uses less digits than its factorization.

1213587633646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67068.

The product of its digits is 13063680, while the sum is 55.

The spelling of 1213587633646 in words is "one trillion, two hundred thirteen billion, five hundred eighty-seven million, six hundred thirty-three thousand, six hundred forty-six".