1215825816450 has 48 divisors (see below), whose sum is σ = 3445997745600. Its totient is φ = 277903043520.

The previous prime is 1215825816431. The next prime is 1215825816473. The reversal of 1215825816450 is 546185285121.

It is a super-3 number, since 3×1215825816450³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215825816450.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 578963625 + ... + 578965724.

It is an arithmetic number, because the mean of its divisors is an integer number (71791619700).

Almost surely, 2^{1215825816450} is an apocalyptic number.

1215825816450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215825816450 is an abundant number, since it is smaller than the sum of its proper divisors (2230171929150).

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

1215825816450 is a wasteful number, since it uses less digits than its factorization.

1215825816450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157929371 (or 1157929366 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 48.

The spelling of 1215825816450 in words is "one trillion, two hundred fifteen billion, eight hundred twenty-five million, eight hundred sixteen thousand, four hundred fifty".