1020165455665 has 16 divisors (see below), whose sum is σ = 1238506848000. Its totient is φ = 806628895360.

The previous prime is 1020165455633. The next prime is 1020165455681. The reversal of 1020165455665 is 5665545610201.

It is a happy number.

It is not a de Polignac number, because 1020165455665 - 2⁵ = 1020165455633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1981540 + ... + 2442709.

It is an arithmetic number, because the mean of its divisors is an integer number (77406678000).

Almost surely, 2^{1020165455665} is an apocalyptic number.

It is an amenable number.

1020165455665 is a deficient number, since it is larger than the sum of its proper divisors (218341392335).

1020165455665 is a wasteful number, since it uses less digits than its factorization.

1020165455665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424792.

The product of its (nonzero) digits is 1080000, while the sum is 46.

The spelling of 1020165455665 in words is "one trillion, twenty billion, one hundred sixty-five million, four hundred fifty-five thousand, six hundred sixty-five".