1065688822921 has 4 divisors (see below), whose sum is σ = 1066407427792. Its totient is φ = 1064970218052.

The previous prime is 1065688822879. The next prime is 1065688822931. The reversal of 1065688822921 is 1292288865601.

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 a de Polignac number, because none of the positive numbers 2^k-1065688822921 is a prime.

It is a super-2 number, since 2×1065688822921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065688822931) 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, 359300211 + ... + 359303176.

It is an arithmetic number, because the mean of its divisors is an integer number (266601856948).

Almost surely, 2^{1065688822921} is an apocalyptic number.

It is an amenable number.

1065688822921 is a deficient number, since it is larger than the sum of its proper divisors (718604871).

1065688822921 is an equidigital number, since it uses as much as digits as its factorization.

1065688822921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718604870.

The product of its (nonzero) digits is 6635520, while the sum is 58.

The spelling of 1065688822921 in words is "one trillion, sixty-five billion, six hundred eighty-eight million, eight hundred twenty-two thousand, nine hundred twenty-one".