15805140644 has 12 divisors (see below), whose sum is σ = 28861561344. Its totient is φ = 7558980264.

The previous prime is 15805140629. The next prime is 15805140647. The reversal of 15805140644 is 44604150851.

It is a junction number, because it is equal to n+sod(n) for n = 15805140598 and 15805140607.

It is not an unprimeable number, because it can be changed into a prime (15805140647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85897412 + ... + 85897595.

It is an arithmetic number, because the mean of its divisors is an integer number (2405130112).

Almost surely, 2^15805140644 is an apocalyptic number.

It is an amenable number.

15805140644 is a deficient number, since it is larger than the sum of its proper divisors (13056420700).

15805140644 is a wasteful number, since it uses less digits than its factorization.

15805140644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171795034 (or 171795032 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 15805140644 in words is "fifteen billion, eight hundred five million, one hundred forty thousand, six hundred forty-four".