15310138642 has 4 divisors (see below), whose sum is σ = 22965207966. Its totient is φ = 7655069320.

The previous prime is 15310138607. The next prime is 15310138643. The reversal of 15310138642 is 24683101351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12068999881 + 3241138761 = 109859^2 + 56931^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15310138598 and 15310138607.

It is not an unprimeable number, because it can be changed into a prime (15310138643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3827534659 + ... + 3827534662.

Almost surely, 2^15310138642 is an apocalyptic number.

15310138642 is a deficient number, since it is larger than the sum of its proper divisors (7655069324).

15310138642 is an equidigital number, since it uses as much as digits as its factorization.

15310138642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655069323.

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 15310138642 its reverse (24683101351), we get a palindrome (39993239993).

The spelling of 15310138642 in words is "fifteen billion, three hundred ten million, one hundred thirty-eight thousand, six hundred forty-two".