1042721775757 has 4 divisors (see below), whose sum is σ = 1062395771580. Its totient is φ = 1023047779936.

The previous prime is 1042721775749. The next prime is 1042721775791. The reversal of 1042721775757 is 7575771272401.

1042721775757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271546252201 + 771175523556 = 521101^2 + 878166^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042721775757 - 2³ = 1042721775749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1042721775698 and 1042721775707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042727775757) 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, 9836997832 + ... + 9836997937.

It is an arithmetic number, because the mean of its divisors is an integer number (265598942895).

Almost surely, 2^{1042721775757} is an apocalyptic number.

It is an amenable number.

1042721775757 is a deficient number, since it is larger than the sum of its proper divisors (19673995823).

1042721775757 is an equidigital number, since it uses as much as digits as its factorization.

1042721775757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19673995822.

The product of its (nonzero) digits is 6722800, while the sum is 55.

The spelling of 1042721775757 in words is "one trillion, forty-two billion, seven hundred twenty-one million, seven hundred seventy-five thousand, seven hundred fifty-seven".