15405420015 has 12 divisors (see below), whose sum is σ = 26702728104. Its totient is φ = 8216223984.

The previous prime is 15405419993. The next prime is 15405420053. The reversal of 15405420015 is 51002450451.

It is not a de Polignac number, because 15405420015 - 2⁶ = 15405419951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171171289 + ... + 171171378.

It is an arithmetic number, because the mean of its divisors is an integer number (2225227342).

Almost surely, 2^15405420015 is an apocalyptic number.

15405420015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15405420015 is a deficient number, since it is larger than the sum of its proper divisors (11297308089).

15405420015 is a wasteful number, since it uses less digits than its factorization.

15405420015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342342678 (or 342342675 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 15405420015 its reverse (51002450451), we get a palindrome (66407870466).

The spelling of 15405420015 in words is "fifteen billion, four hundred five million, four hundred twenty thousand, fifteen".