1671666738 has 16 divisors (see below), whose sum is σ = 3820952640. Its totient is φ = 477619056.

The previous prime is 1671666727. The next prime is 1671666757. The reversal of 1671666738 is 8376661761.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19900753 + ... + 19900836.

It is an arithmetic number, because the mean of its divisors is an integer number (238809540).

Almost surely, 2^1671666738 is an apocalyptic number.

1671666738 is an abundant number, since it is smaller than the sum of its proper divisors (2149285902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1671666738 is a wasteful number, since it uses less digits than its factorization.

1671666738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39801601.

The product of its digits is 1524096, while the sum is 51.

The square root of 1671666738 is about 40886.0213031300. The cubic root of 1671666738 is about 1186.8155658204.

The spelling of 1671666738 in words is "one billion, six hundred seventy-one million, six hundred sixty-six thousand, seven hundred thirty-eight".