15515442425 has 48 divisors (see below), whose sum is σ = 22627218432. Its totient is φ = 10332057600.

The previous prime is 15515442409. The next prime is 15515442431. The reversal of 15515442425 is 52424451551.

It is not a de Polignac number, because 15515442425 - 2⁴ = 15515442409 is a prime.

It is a Curzon 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, 1595177 + ... + 1604873.

It is an arithmetic number, because the mean of its divisors is an integer number (471400384).

Almost surely, 2^15515442425 is an apocalyptic number.

It is an amenable number.

15515442425 is a deficient number, since it is larger than the sum of its proper divisors (7111776007).

15515442425 is a wasteful number, since it uses less digits than its factorization.

15515442425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978 (or 9973 counting only the distinct ones).

The product of its digits is 160000, while the sum is 38.

Adding to 15515442425 its reverse (52424451551), we get a palindrome (67939893976).

The spelling of 15515442425 in words is "fifteen billion, five hundred fifteen million, four hundred forty-two thousand, four hundred twenty-five".