15640040014 has 4 divisors (see below), whose sum is σ = 23460060024. Its totient is φ = 7820020006.

The previous prime is 15640039999. The next prime is 15640040033. The reversal of 15640040014 is 41004004651.

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

It is a super-2 number, since 2×15640040014² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910010002 + ... + 3910010005.

It is an arithmetic number, because the mean of its divisors is an integer number (5865015006).

Almost surely, 2^15640040014 is an apocalyptic number.

15640040014 is a deficient number, since it is larger than the sum of its proper divisors (7820020010).

15640040014 is an equidigital number, since it uses as much as digits as its factorization.

15640040014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820020009.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 15640040014 its reverse (41004004651), we get a palindrome (56644044665).

The spelling of 15640040014 in words is "fifteen billion, six hundred forty million, forty thousand, fourteen".