1868704661 has 4 divisors (see below), whose sum is σ = 1868927424. Its totient is φ = 1868481900.

The previous prime is 1868704657. The next prime is 1868704681. The reversal of 1868704661 is 1664078681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1868704661 - 2² = 1868704657 is a prime.

It is a super-2 number, since 2×1868704661² = 6984114220086249842, 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 (1868704681) 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 3 ways as a sum of consecutive naturals, for example, 98285 + ... + 115746.

It is an arithmetic number, because the mean of its divisors is an integer number (467231856).

Almost surely, 2^1868704661 is an apocalyptic number.

It is an amenable number.

1868704661 is a deficient number, since it is larger than the sum of its proper divisors (222763).

1868704661 is an equidigital number, since it uses as much as digits as its factorization.

1868704661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222762.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 1868704661 is about 43228.5167568817. The cubic root of 1868704661 is about 1231.7244327750.

The spelling of 1868704661 in words is "one billion, eight hundred sixty-eight million, seven hundred four thousand, six hundred sixty-one".