1662361802965 has 4 divisors (see below), whose sum is σ = 1994834163564. Its totient is φ = 1329889442368.

The previous prime is 1662361802947. The next prime is 1662361802971. The reversal of 1662361802965 is 5692081632661.

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 1129528960849 + 532832842116 = 1062793^2 + 729954^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662361802965 - 2²⁷ = 1662227585237 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 166236180292 + ... + 166236180301.

It is an arithmetic number, because the mean of its divisors is an integer number (498708540891).

Almost surely, 2^{1662361802965} is an apocalyptic number.

It is an amenable number.

1662361802965 is a deficient number, since it is larger than the sum of its proper divisors (332472360599).

1662361802965 is an equidigital number, since it uses as much as digits as its factorization.

1662361802965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332472360598.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 1662361802965 in words is "one trillion, six hundred sixty-two billion, three hundred sixty-one million, eight hundred two thousand, nine hundred sixty-five".