1020728775701 has 4 divisors (see below), whose sum is σ = 1065108287712. Its totient is φ = 976349263692.

The previous prime is 1020728775697. The next prime is 1020728775707. The reversal of 1020728775701 is 1075778270201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020728775701 - 2² = 1020728775697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020728775707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22189755971 + ... + 22189756016.

It is an arithmetic number, because the mean of its divisors is an integer number (266277071928).

Almost surely, 2^{1020728775701} is an apocalyptic number.

It is an amenable number.

1020728775701 is a deficient number, since it is larger than the sum of its proper divisors (44379512011).

1020728775701 is an equidigital number, since it uses as much as digits as its factorization.

1020728775701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44379512010.

The product of its (nonzero) digits is 384160, while the sum is 47.

The spelling of 1020728775701 in words is "one trillion, twenty billion, seven hundred twenty-eight million, seven hundred seventy-five thousand, seven hundred one".