1661755045 has 16 divisors (see below), whose sum is σ = 2019584880. Its totient is φ = 1312464384.

The previous prime is 1661755021. The next prime is 1661755097. The reversal of 1661755045 is 5405571661.

It can be written as a sum of positive squares in 8 ways, for example, as 121506529 + 1540248516 = 11023^2 + 39246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661755045 - 2⁷ = 1661754917 is a prime.

It is a super-2 number, since 2×1661755045² = 5522859659165904050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661754989 and 1661755007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334399 + ... + 339331.

It is an arithmetic number, because the mean of its divisors is an integer number (126224055).

Almost surely, 2^1661755045 is an apocalyptic number.

It is an amenable number.

1661755045 is a deficient number, since it is larger than the sum of its proper divisors (357829835).

1661755045 is an equidigital number, since it uses as much as digits as its factorization.

1661755045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 1661755045 is about 40764.6298278299. The cubic root of 1661755045 is about 1184.4652812506.

The spelling of 1661755045 in words is "one billion, six hundred sixty-one million, seven hundred fifty-five thousand, forty-five".