1667739157 has 18 divisors (see below), whose sum is σ = 1952144322. Its totient is φ = 1420612704.

The previous prime is 1667739137. The next prime is 1667739187. The reversal of 1667739157 is 7519377661.

It can be written as a sum of positive squares in 3 ways, for example, as 1475251281 + 192487876 = 38409^2 + 13874^2 .

It is not a de Polignac number, because 1667739157 - 2¹¹ = 1667737109 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 (1667739137) 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 17 ways as a sum of consecutive naturals, for example, 1901203 + ... + 1902079.

Almost surely, 2^1667739157 is an apocalyptic number.

It is an amenable number.

1667739157 is a deficient number, since it is larger than the sum of its proper divisors (284405165).

1667739157 is an frugal number, since it uses more digits than its factorization.

1667739157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285 (or 1081 counting only the distinct ones).

The product of its digits is 1666980, while the sum is 52.

The square root of 1667739157 is about 40837.9622043020. The cubic root of 1667739157 is about 1185.8853625450.

The spelling of 1667739157 in words is "one billion, six hundred sixty-seven million, seven hundred thirty-nine thousand, one hundred fifty-seven".