1664521149 has 8 divisors (see below), whose sum is σ = 2295891360. Its totient is φ = 1071415856.

The previous prime is 1664521129. The next prime is 1664521181. The reversal of 1664521149 is 9411254661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664521149 - 2¹⁵ = 1664488381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664521129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9566127 + ... + 9566300.

It is an arithmetic number, because the mean of its divisors is an integer number (286986420).

Almost surely, 2^1664521149 is an apocalyptic number.

It is an amenable number.

1664521149 is a deficient number, since it is larger than the sum of its proper divisors (631370211).

1664521149 is a wasteful number, since it uses less digits than its factorization.

1664521149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19132459.

The product of its digits is 51840, while the sum is 39.

The square root of 1664521149 is about 40798.5434666484. The cubic root of 1664521149 is about 1185.1221245355.

The spelling of 1664521149 in words is "one billion, six hundred sixty-four million, five hundred twenty-one thousand, one hundred forty-nine".