1898050661 has 6 divisors (see below), whose sum is σ = 2055285810. Its totient is φ = 1752046608.

The previous prime is 1898050639. The next prime is 1898050703. The reversal of 1898050661 is 1660508981.

It can be written as a sum of positive squares in 3 ways, for example, as 15358561 + 1882692100 = 3919^2 + 43390^2 .

It is not a de Polignac number, because 1898050661 - 2¹⁸ = 1897788517 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 (1898050621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5615366 + ... + 5615703.

It is an arithmetic number, because the mean of its divisors is an integer number (342547635).

Almost surely, 2^1898050661 is an apocalyptic number.

It is an amenable number.

1898050661 is a deficient number, since it is larger than the sum of its proper divisors (157235149).

1898050661 is a wasteful number, since it uses less digits than its factorization.

1898050661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11231095 (or 11231082 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 1898050661 is about 43566.6232453239. The cubic root of 1898050661 is about 1238.1386096275.

The spelling of 1898050661 in words is "one billion, eight hundred ninety-eight million, fifty thousand, six hundred sixty-one".