1020775731656 has 16 divisors (see below), whose sum is σ = 1965682997340. Its totient is φ = 496593599040.

The previous prime is 1020775731637. The next prime is 1020775731667. The reversal of 1020775731656 is 6561375770201.

It can be written as a sum of positive squares in 2 ways, for example, as 998332695556 + 22443036100 = 999166^2 + 149810^2 .

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, 1724283035 + ... + 1724283626.

Almost surely, 2^{1020775731656} is an apocalyptic number.

It is an amenable number.

1020775731656 is a deficient number, since it is larger than the sum of its proper divisors (944907265684).

1020775731656 is a wasteful number, since it uses less digits than its factorization.

1020775731656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3448566704 (or 3448566700 counting only the distinct ones).

The product of its (nonzero) digits is 1852200, while the sum is 50.

The spelling of 1020775731656 in words is "one trillion, twenty billion, seven hundred seventy-five million, seven hundred thirty-one thousand, six hundred fifty-six".