15640405013 has 8 divisors (see below), whose sum is σ = 16454903640. Its totient is φ = 14846526720.

The previous prime is 15640404907. The next prime is 15640405021. The reversal of 15640405013 is 31050404651.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49885969 + 15590519044 = 7063^2 + 124862^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15640405013 - 2¹² = 15640400917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640405813) 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, 5153528 + ... + 5156561.

It is an arithmetic number, because the mean of its divisors is an integer number (2056862955).

Almost surely, 2^15640405013 is an apocalyptic number.

It is an amenable number.

15640405013 is a deficient number, since it is larger than the sum of its proper divisors (814498627).

15640405013 is a wasteful number, since it uses less digits than its factorization.

15640405013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310167.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 15640405013 its reverse (31050404651), we get a palindrome (46690809664).

The spelling of 15640405013 in words is "fifteen billion, six hundred forty million, four hundred five thousand, thirteen".