1664526357 has 12 divisors (see below), whose sum is σ = 2589263404. Its totient is φ = 1024323840.

The previous prime is 1664526341. The next prime is 1664526373. The reversal of 1664526357 is 7536254661.

1664526357 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 5 + 2 + 635 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (1664526341) and next prime (1664526373).

It can be written as a sum of positive squares in 2 ways, for example, as 944087076 + 720439281 = 30726^2 + 26841^2 .

It is not a de Polignac number, because 1664526357 - 2⁴ = 1664526341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664526397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7113244 + ... + 7113477.

Almost surely, 2^1664526357 is an apocalyptic number.

It is an amenable number.

1664526357 is a deficient number, since it is larger than the sum of its proper divisors (924737047).

1664526357 is a wasteful number, since it uses less digits than its factorization.

1664526357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14226740 (or 14226737 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 1664526357 is about 40798.6072924064. The cubic root of 1664526357 is about 1185.1233605485.

The spelling of 1664526357 in words is "one billion, six hundred sixty-four million, five hundred twenty-six thousand, three hundred fifty-seven".