1668270537 has 12 divisors (see below), whose sum is σ = 2551472820. Its totient is φ = 1046757888.

The previous prime is 1668270521. The next prime is 1668270553. The reversal of 1668270537 is 7350728661.

It is an interprime number because it is at equal distance from previous prime (1668270521) and next prime (1668270553).

It can be written as a sum of positive squares in 2 ways, for example, as 493906176 + 1174364361 = 22224^2 + 34269^2 .

It is not a de Polignac number, because 1668270537 - 2⁴ = 1668270521 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1668270492 and 1668270501.

It is not an unprimeable number, because it can be changed into a prime (1668270137) 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, 5451712 + ... + 5452017.

It is an arithmetic number, because the mean of its divisors is an integer number (212622735).

Almost surely, 2^1668270537 is an apocalyptic number.

1668270537 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1668270537 is a deficient number, since it is larger than the sum of its proper divisors (883202283).

1668270537 is a wasteful number, since it uses less digits than its factorization.

1668270537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10903752 (or 10903749 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 1668270537 is about 40844.4676425094. The cubic root of 1668270537 is about 1186.0112992752.

The spelling of 1668270537 in words is "one billion, six hundred sixty-eight million, two hundred seventy thousand, five hundred thirty-seven".