1855616465 has 4 divisors (see below), whose sum is σ = 2226739764. Its totient is φ = 1484493168.

The previous prime is 1855616461. The next prime is 1855616479. The reversal of 1855616465 is 5646165581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 435306496 + 1420309969 = 20864^2 + 37687^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855616465 - 2² = 1855616461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855616461) 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, 185561642 + ... + 185561651.

It is an arithmetic number, because the mean of its divisors is an integer number (556684941).

Almost surely, 2^1855616465 is an apocalyptic number.

It is an amenable number.

1855616465 is a deficient number, since it is larger than the sum of its proper divisors (371123299).

1855616465 is an equidigital number, since it uses as much as digits as its factorization.

1855616465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371123298.

The product of its digits is 864000, while the sum is 47.

The square root of 1855616465 is about 43076.8669357464. The cubic root of 1855616465 is about 1228.8420735064.

The spelling of 1855616465 in words is "one billion, eight hundred fifty-five million, six hundred sixteen thousand, four hundred sixty-five".