1215451554534 has 128 divisors (see below), whose sum is σ = 3154976640000. Its totient is φ = 346707581472.

The previous prime is 1215451554523. The next prime is 1215451554557. The reversal of 1215451554534 is 4354551545121.

1215451554534 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 45 + 1 + 554 + 53 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1215451554534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11412112 + ... + 11518124.

It is an arithmetic number, because the mean of its divisors is an integer number (24648255000).

Almost surely, 2^{1215451554534} is an apocalyptic number.

1215451554534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215451554534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577488320000).

1215451554534 is an abundant number, since it is smaller than the sum of its proper divisors (1939525085466).

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

1215451554534 is a wasteful number, since it uses less digits than its factorization.

1215451554534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106664 (or 106644 counting only the distinct ones).

The product of its digits is 1200000, while the sum is 45.

The spelling of 1215451554534 in words is "one trillion, two hundred fifteen billion, four hundred fifty-one million, five hundred fifty-four thousand, five hundred thirty-four".