1661737003 has 2 divisors, whose sum is σ = 1661737004. Its totient is φ = 1661737002.

The previous prime is 1661736983. The next prime is 1661737019. The reversal of 1661737003 is 3007371661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661737003 - 2⁵ = 1661736971 is a prime.

It is a super-2 number, since 2×1661737003² = 5522739734278844018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1661737003.

It is not a weakly prime, because it can be changed into another prime (1661737073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830868501 + 830868502.

It is an arithmetic number, because the mean of its divisors is an integer number (830868502).

Almost surely, 2^1661737003 is an apocalyptic number.

1661737003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661737003 is an equidigital number, since it uses as much as digits as its factorization.

1661737003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 1661737003 is about 40764.4085324441. The cubic root of 1661737003 is about 1184.4609945779.

The spelling of 1661737003 in words is "one billion, six hundred sixty-one million, seven hundred thirty-seven thousand, three".