15640464137 has 8 divisors (see below), whose sum is σ = 16486881600. Its totient is φ = 14796370224.

The previous prime is 15640464127. The next prime is 15640464149. The reversal of 15640464137 is 73146404651.

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 15640464137 - 2²² = 15636269833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15640464094 and 15640464103.

It is not an unprimeable number, because it can be changed into a prime (15640464127) 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, 567053 + ... + 593994.

It is an arithmetic number, because the mean of its divisors is an integer number (2060860200).

Almost surely, 2^15640464137 is an apocalyptic number.

It is an amenable number.

15640464137 is a deficient number, since it is larger than the sum of its proper divisors (846417463).

15640464137 is a wasteful number, since it uses less digits than its factorization.

15640464137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161775.

The product of its (nonzero) digits is 241920, while the sum is 41.

Adding to 15640464137 its reverse (73146404651), we get a palindrome (88786868788).

The spelling of 15640464137 in words is "fifteen billion, six hundred forty million, four hundred sixty-four thousand, one hundred thirty-seven".