1669355381 has 16 divisors (see below), whose sum is σ = 1748796480. Its totient is φ = 1591891200.

The previous prime is 1669355339. The next prime is 1669355423. The reversal of 1669355381 is 1835539661.

It is an interprime number because it is at equal distance from previous prime (1669355339) and next prime (1669355423).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669355381 is a prime.

It is a super-2 number, since 2×1669355381² = 5573494776147310322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669355321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 874430 + ... + 876336.

It is an arithmetic number, because the mean of its divisors is an integer number (109299780).

Almost surely, 2^1669355381 is an apocalyptic number.

It is an amenable number.

1669355381 is a deficient number, since it is larger than the sum of its proper divisors (79441099).

1669355381 is a wasteful number, since it uses less digits than its factorization.

1669355381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404.

The product of its digits is 583200, while the sum is 47.

The square root of 1669355381 is about 40857.7456671315. The cubic root of 1669355381 is about 1186.2683236251.

The spelling of 1669355381 in words is "one billion, six hundred sixty-nine million, three hundred fifty-five thousand, three hundred eighty-one".