1690007275921 has 4 divisors (see below), whose sum is σ = 1693131134644. Its totient is φ = 1686883417200.

The previous prime is 1690007275867. The next prime is 1690007275949. The reversal of 1690007275921 is 1295727000961.

It is a happy number.

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 1295296648321 + 394710627600 = 1138111^2 + 628260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690007275921 - 2⁹ = 1690007275409 is a prime.

It is a super-2 number, since 2×1690007275921² (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 (1690007275981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561928550 + ... + 1561929631.

It is an arithmetic number, because the mean of its divisors is an integer number (423282783661).

Almost surely, 2^{1690007275921} is an apocalyptic number.

It is an amenable number.

1690007275921 is a deficient number, since it is larger than the sum of its proper divisors (3123858723).

1690007275921 is an equidigital number, since it uses as much as digits as its factorization.

1690007275921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123858722.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 1690007275921 in words is "one trillion, six hundred ninety billion, seven million, two hundred seventy-five thousand, nine hundred twenty-one".