1020775731563 has 16 divisors (see below), whose sum is σ = 1197712204800. Its totient is φ = 869582784168.

The previous prime is 1020775731533. The next prime is 1020775731593. The reversal of 1020775731563 is 3651375770201.

It is an interprime number because it is at equal distance from previous prime (1020775731533) and next prime (1020775731593).

It is not a de Polignac number, because 1020775731563 - 2⁶ = 1020775731499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020775731533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9072995 + ... + 9184812.

It is an arithmetic number, because the mean of its divisors is an integer number (74857012800).

Almost surely, 2^{1020775731563} is an apocalyptic number.

1020775731563 is a deficient number, since it is larger than the sum of its proper divisors (176936473237).

1020775731563 is an equidigital number, since it uses as much as digits as its factorization.

1020775731563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18257991 (or 18257977 counting only the distinct ones).

The product of its (nonzero) digits is 926100, while the sum is 47.

The spelling of 1020775731563 in words is "one trillion, twenty billion, seven hundred seventy-five million, seven hundred thirty-one thousand, five hundred sixty-three".