1213777681368 has 64 divisors (see below), whose sum is σ = 3480277777920. Its totient is φ = 345559468800.

The previous prime is 1213777681357. The next prime is 1213777681379. The reversal of 1213777681368 is 8631867773121.

It is an interprime number because it is at equal distance from previous prime (1213777681357) and next prime (1213777681379).

It is a nude number because it is divisible by every one of its digits.

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, 12808428 + ... + 12902843.

It is an arithmetic number, because the mean of its divisors is an integer number (54379340280).

Almost surely, 2^{1213777681368} is an apocalyptic number.

It is an amenable number.

1213777681368 is an abundant number, since it is smaller than the sum of its proper divisors (2266500096552).

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

1213777681368 is a wasteful number, since it uses less digits than its factorization.

1213777681368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25711568 (or 25711564 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 60.

The spelling of 1213777681368 in words is "one trillion, two hundred thirteen billion, seven hundred seventy-seven million, six hundred eighty-one thousand, three hundred sixty-eight".