1215551423405 has 16 divisors (see below), whose sum is σ = 1591327512000. Its totient is φ = 884003957760.

The previous prime is 1215551423363. The next prime is 1215551423407. The reversal of 1215551423405 is 5043241555121.

It is not a de Polignac number, because 1215551423405 - 2³⁰ = 1214477681581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215551423407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1098746 + ... + 1907444.

It is an arithmetic number, because the mean of its divisors is an integer number (99457969500).

Almost surely, 2^{1215551423405} is an apocalyptic number.

It is an amenable number.

1215551423405 is a deficient number, since it is larger than the sum of its proper divisors (375776088595).

1215551423405 is a wasteful number, since it uses less digits than its factorization.

1215551423405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836044.

The product of its (nonzero) digits is 120000, while the sum is 38.

Adding to 1215551423405 its reverse (5043241555121), we get a palindrome (6258792978526).

The spelling of 1215551423405 in words is "one trillion, two hundred fifteen billion, five hundred fifty-one million, four hundred twenty-three thousand, four hundred five".