1816020815 has 16 divisors (see below), whose sum is σ = 2492328960. Its totient is φ = 1244378400.

The previous prime is 1816020809. The next prime is 1816020823. The reversal of 1816020815 is 5180206181.

It is not a de Polignac number, because 1816020815 - 2⁶ = 1816020751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32906 + ... + 68664.

It is an arithmetic number, because the mean of its divisors is an integer number (155770560).

Almost surely, 2^1816020815 is an apocalyptic number.

1816020815 is a deficient number, since it is larger than the sum of its proper divisors (676308145).

1816020815 is a wasteful number, since it uses less digits than its factorization.

1816020815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37222.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 1816020815 is about 42614.7957287138. The cubic root of 1816020815 is about 1220.0387014060.

Adding to 1816020815 its reverse (5180206181), we get a palindrome (6996226996).

The spelling of 1816020815 in words is "one billion, eight hundred sixteen million, twenty thousand, eight hundred fifteen".