1020775731642 has 12 divisors (see below), whose sum is σ = 2211680751930. Its totient is φ = 340258577208.

The previous prime is 1020775731637. The next prime is 1020775731667. The reversal of 1020775731642 is 2461375770201.

1020775731642 is a `hidden beast` number, since 1 + 0 + 2 + 0 + 77 + 573 + 1 + 6 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 909240438681 + 111535292961 = 953541^2 + 333969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28354881417 + ... + 28354881452.

Almost surely, 2^{1020775731642} is an apocalyptic number.

1020775731642 is an abundant number, since it is smaller than the sum of its proper divisors (1190905020288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020775731642 is a wasteful number, since it uses less digits than its factorization.

1020775731642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56709762877 (or 56709762874 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 1020775731642 in words is "one trillion, twenty billion, seven hundred seventy-five million, seven hundred thirty-one thousand, six hundred forty-two".