15515442402 has 16 divisors (see below), whose sum is σ = 32031881472. Its totient is φ = 5004981360.

The previous prime is 15515442401. The next prime is 15515442407. The reversal of 15515442402 is 20424451551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (15515442401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41707993 + ... + 41708364.

It is an arithmetic number, because the mean of its divisors is an integer number (2001992592).

Almost surely, 2^15515442402 is an apocalyptic number.

15515442402 is an abundant number, since it is smaller than the sum of its proper divisors (16516439070).

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

15515442402 is a wasteful number, since it uses less digits than its factorization.

15515442402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83416393.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 15515442402 its reverse (20424451551), we get a palindrome (35939893953).

The spelling of 15515442402 in words is "fifteen billion, five hundred fifteen million, four hundred forty-two thousand, four hundred two".