1215551332125 has 48 divisors (see below), whose sum is σ = 2359790347824. Its totient is φ = 598425264000.

The previous prime is 1215551332111. The next prime is 1215551332213. The reversal of 1215551332125 is 5212331555121.

1215551332125 is a `hidden beast` number, since 1 + 2 + 15 + 5 + 513 + 3 + 2 + 125 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 548294339961 + 667256992164 = 740469^2 + 816858^2 .

It is not a de Polignac number, because 1215551332125 - 2¹² = 1215551328029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215551332125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41542686 + ... + 41571935.

It is an arithmetic number, because the mean of its divisors is an integer number (49162298913).

Almost surely, 2^{1215551332125} is an apocalyptic number.

1215551332125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215551332125 is a deficient number, since it is larger than the sum of its proper divisors (1144239015699).

1215551332125 is a wasteful number, since it uses less digits than its factorization.

1215551332125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83114655 (or 83114642 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

Adding to 1215551332125 its reverse (5212331555121), we get a palindrome (6427882887246).

The spelling of 1215551332125 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, three hundred thirty-two thousand, one hundred twenty-five".