1801045657 has 18 divisors (see below), whose sum is σ = 1893827754. Its totient is φ = 1712568960.

The previous prime is 1801045643. The next prime is 1801045661. The reversal of 1801045657 is 7565401081.

It can be written as a sum of positive squares in only one way, i.e., 1503965961 + 297079696 = 38781^2 + 17236^2 .

It is not a de Polignac number, because 1801045657 - 2⁷ = 1801045529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1801045607) 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 17 ways as a sum of consecutive naturals, for example, 12957094 + ... + 12957232.

It is an arithmetic number, because the mean of its divisors is an integer number (105212653).

Almost surely, 2^1801045657 is an apocalyptic number.

It is an amenable number.

1801045657 is a deficient number, since it is larger than the sum of its proper divisors (92782097).

1801045657 is an frugal number, since it uses more digits than its factorization.

1801045657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 1801045657 is about 42438.7282679394. The cubic root of 1801045657 is about 1216.6759052613.

It can be divided in two parts, 180104 and 5657, that added together give a square (185761 = 431²).

The spelling of 1801045657 in words is "one billion, eight hundred one million, forty-five thousand, six hundred fifty-seven".