1020775731645 has 32 divisors (see below), whose sum is σ = 1664299954944. Its totient is φ = 534063795200.

The previous prime is 1020775731637. The next prime is 1020775731667. The reversal of 1020775731645 is 5461375770201.

It is not a de Polignac number, because 1020775731645 - 2³ = 1020775731637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020775731594 and 1020775731603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5571040 + ... + 5751350.

It is an arithmetic number, because the mean of its divisors is an integer number (52009373592).

Almost surely, 2^{1020775731645} is an apocalyptic number.

1020775731645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020775731645 is a deficient number, since it is larger than the sum of its proper divisors (643524223299).

1020775731645 is a wasteful number, since it uses less digits than its factorization.

1020775731645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187493.

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 1020775731645 in words is "one trillion, twenty billion, seven hundred seventy-five million, seven hundred thirty-one thousand, six hundred forty-five".