1690153901221 has 4 divisors (see below), whose sum is σ = 1763638853472. Its totient is φ = 1616668948972.

The previous prime is 1690153901213. The next prime is 1690153901239. The reversal of 1690153901221 is 1221093510961.

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 1690153901221 - 2³ = 1690153901213 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 (1690153901201) 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, 36742476091 + ... + 36742476136.

It is an arithmetic number, because the mean of its divisors is an integer number (440909713368).

Almost surely, 2^{1690153901221} is an apocalyptic number.

It is an amenable number.

1690153901221 is a deficient number, since it is larger than the sum of its proper divisors (73484952251).

1690153901221 is an equidigital number, since it uses as much as digits as its factorization.

1690153901221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73484952250.

The product of its (nonzero) digits is 29160, while the sum is 40.

The spelling of 1690153901221 in words is "one trillion, six hundred ninety billion, one hundred fifty-three million, nine hundred one thousand, two hundred twenty-one".