1020407864665 has 16 divisors (see below), whose sum is σ = 1413272113920. Its totient is φ = 692780443200.

The previous prime is 1020407864647. The next prime is 1020407864677. The reversal of 1020407864665 is 5664687040201.

It is not a de Polignac number, because 1020407864665 - 2⁵ = 1020407864633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144325725 + ... + 144332794.

It is an arithmetic number, because the mean of its divisors is an integer number (88329507120).

Almost surely, 2^{1020407864665} is an apocalyptic number.

It is an amenable number.

1020407864665 is a deficient number, since it is larger than the sum of its proper divisors (392864249255).

1020407864665 is a wasteful number, since it uses less digits than its factorization.

1020407864665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288658632.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 1020407864665 in words is "one trillion, twenty billion, four hundred seven million, eight hundred sixty-four thousand, six hundred sixty-five".