1864065815 has 8 divisors (see below), whose sum is σ = 2244784848. Its totient is φ = 1485982080.

The previous prime is 1864065787. The next prime is 1864065823. The reversal of 1864065815 is 5185604681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1864065815 - 2⁸ = 1864065559 is a prime.

It is a super-2 number, since 2×1864065815² = 6949482725303228450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657266 + ... + 660095.

It is an arithmetic number, because the mean of its divisors is an integer number (280598106).

Almost surely, 2^1864065815 is an apocalyptic number.

1864065815 is a deficient number, since it is larger than the sum of its proper divisors (380719033).

1864065815 is a wasteful number, since it uses less digits than its factorization.

1864065815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317649.

The product of its (nonzero) digits is 230400, while the sum is 44.

The square root of 1864065815 is about 43174.8284883681. The cubic root of 1864065815 is about 1230.7043831573.

The spelling of 1864065815 in words is "one billion, eight hundred sixty-four million, sixty-five thousand, eight hundred fifteen".