1216156505600 has 60 divisors (see below), whose sum is σ = 3013122786564. Its totient is φ = 486462597120.

The previous prime is 1216156505593. The next prime is 1216156505633. The reversal of 1216156505600 is 65056516121.

It is a happy number.

It is a super-2 number, since 2×1216156505600² (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 5 ways as a sum of consecutive naturals, for example, 47493314 + ... + 47518913.

Almost surely, 2^{1216156505600} is an apocalyptic number.

1216156505600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216156505600 is an abundant number, since it is smaller than the sum of its proper divisors (1796966280964).

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

1216156505600 is an frugal number, since it uses more digits than its factorization.

1216156505600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95012255 (or 95012234 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 1216156505600 in words is "one trillion, two hundred sixteen billion, one hundred fifty-six million, five hundred five thousand, six hundred".