15515343642 has 16 divisors (see below), whose sum is σ = 31455766080. Its totient is φ = 5100934752.

The previous prime is 15515343637. The next prime is 15515343643. The reversal of 15515343642 is 24634351551.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 15515343642.

It is not an unprimeable number, because it can be changed into a prime (15515343643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17711142 + ... + 17712017.

It is an arithmetic number, because the mean of its divisors is an integer number (1965985380).

Almost surely, 2^15515343642 is an apocalyptic number.

15515343642 is an abundant number, since it is smaller than the sum of its proper divisors (15940422438).

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

15515343642 is a wasteful number, since it uses less digits than its factorization.

15515343642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35423237.

The product of its digits is 216000, while the sum is 39.

The spelling of 15515343642 in words is "fifteen billion, five hundred fifteen million, three hundred forty-three thousand, six hundred forty-two".