1048666920661 has 4 divisors (see below), whose sum is σ = 1049963172300. Its totient is φ = 1047370669024.

The previous prime is 1048666920547. The next prime is 1048666920709. The reversal of 1048666920661 is 1660296668401.

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 864695412100 + 183971508561 = 929890^2 + 428919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1048666920661 - 2¹¹ = 1048666918613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1048666924661) 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, 648124606 + ... + 648126223.

It is an arithmetic number, because the mean of its divisors is an integer number (262490793075).

Almost surely, 2^{1048666920661} is an apocalyptic number.

It is an amenable number.

1048666920661 is a deficient number, since it is larger than the sum of its proper divisors (1296251639).

1048666920661 is an equidigital number, since it uses as much as digits as its factorization.

1048666920661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296251638.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 1048666920661 in words is "one trillion, forty-eight billion, six hundred sixty-six million, nine hundred twenty thousand, six hundred sixty-one".