15515442426 has 32 divisors (see below), whose sum is σ = 34118443008. Its totient is φ = 4664625840.

The previous prime is 15515442409. The next prime is 15515442431. The reversal of 15515442426 is 62424451551.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 917140 + ... + 933903.

It is an arithmetic number, because the mean of its divisors is an integer number (1066201344).

Almost surely, 2^15515442426 is an apocalyptic number.

15515442426 is an abundant number, since it is smaller than the sum of its proper divisors (18603000582).

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

15515442426 is a wasteful number, since it uses less digits than its factorization.

15515442426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851186.

The product of its digits is 192000, while the sum is 39.

Adding to 15515442426 its reverse (62424451551), we get a palindrome (77939893977).

The spelling of 15515442426 in words is "fifteen billion, five hundred fifteen million, four hundred forty-two thousand, four hundred twenty-six".