1661763 has 4 divisors (see below), whose sum is σ = 2215688. Its totient is φ = 1107840.

The previous prime is 1661741. The next prime is 1661789. The reversal of 1661763 is 3671661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1661763 - 2⁵ = 1661731 is a prime.

It is a super-2 number, since 2×1661763² = 5522912536338, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661763.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276958 + ... + 276963.

It is an arithmetic number, because the mean of its divisors is an integer number (553922).

2^1661763 is an apocalyptic number.

1661763 is a deficient number, since it is larger than the sum of its proper divisors (553925).

1661763 is an equidigital number, since it uses as much as digits as its factorization.

1661763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553924.

The product of its digits is 4536, while the sum is 30.

The square root of 1661763 is about 1289.0938678002. The cubic root of 1661763 is about 118.4467171302.

The spelling of 1661763 in words is "one million, six hundred sixty-one thousand, seven hundred sixty-three".