1217557210772 has 12 divisors (see below), whose sum is σ = 2435114421600. Its totient is φ = 521810233176.

The previous prime is 1217557210757. The next prime is 1217557210781. The reversal of 1217557210772 is 2770127557121.

1217557210772 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21742093022 + ... + 21742093077.

It is an arithmetic number, because the mean of its divisors is an integer number (202926201800).

Almost surely, 2^{1217557210772} is an apocalyptic number.

It is an amenable number.

1217557210772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1217557210772 is a wasteful number, since it uses less digits than its factorization.

1217557210772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43484186110 (or 43484186108 counting only the distinct ones).

The product of its (nonzero) digits is 480200, while the sum is 47.

The spelling of 1217557210772 in words is "one trillion, two hundred seventeen billion, five hundred fifty-seven million, two hundred ten thousand, seven hundred seventy-two".