1216533751450 has 48 divisors (see below), whose sum is σ = 2305385258400. Its totient is φ = 477523929920.

The previous prime is 1216533751441. The next prime is 1216533751451. The reversal of 1216533751450 is 541573356121.

It is a junction number, because it is equal to n+sod(n) for n = 1216533751397 and 1216533751406.

It is not an unprimeable number, because it can be changed into a prime (1216533751451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 365344 + ... + 1602043.

It is an arithmetic number, because the mean of its divisors is an integer number (48028859550).

Almost surely, 2^{1216533751450} is an apocalyptic number.

1216533751450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216533751450 is a deficient number, since it is larger than the sum of its proper divisors (1088851506950).

1216533751450 is a wasteful number, since it uses less digits than its factorization.

1216533751450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967631 (or 1967626 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 1216533751450 in words is "one trillion, two hundred sixteen billion, five hundred thirty-three million, seven hundred fifty-one thousand, four hundred fifty".