1815655345009 has 4 divisors (see below), whose sum is σ = 1980714921840. Its totient is φ = 1650595768180.

The previous prime is 1815655344977. The next prime is 1815655345037. The reversal of 1815655345009 is 9005435565181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1815655345009 - 2⁵ = 1815655344977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1815655345039) 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, 82529788399 + ... + 82529788420.

It is an arithmetic number, because the mean of its divisors is an integer number (495178730460).

Almost surely, 2^{1815655345009} is an apocalyptic number.

It is an amenable number.

1815655345009 is a deficient number, since it is larger than the sum of its proper divisors (165059576831).

1815655345009 is a wasteful number, since it uses less digits than its factorization.

1815655345009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165059576830.

The product of its (nonzero) digits is 3240000, while the sum is 52.

The spelling of 1815655345009 in words is "one trillion, eight hundred fifteen billion, six hundred fifty-five million, three hundred forty-five thousand, nine".