1642955865 has 8 divisors (see below), whose sum is σ = 2628729408. Its totient is φ = 876243120.

The previous prime is 1642955819. The next prime is 1642955917. The reversal of 1642955865 is 5685592461.

It is a happy number.

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

It is not a de Polignac number, because 1642955865 - 2⁸ = 1642955609 is a prime.

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, 54765181 + ... + 54765210.

It is an arithmetic number, because the mean of its divisors is an integer number (328591176).

Almost surely, 2^1642955865 is an apocalyptic number.

1642955865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1642955865 is a deficient number, since it is larger than the sum of its proper divisors (985773543).

1642955865 is a wasteful number, since it uses less digits than its factorization.

1642955865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109530399.

The product of its digits is 2592000, while the sum is 51.

The square root of 1642955865 is about 40533.3919750124. The cubic root of 1642955865 is about 1179.9817733946.

The spelling of 1642955865 in words is "one billion, six hundred forty-two million, nine hundred fifty-five thousand, eight hundred sixty-five".