1661748395 has 8 divisors (see below), whose sum is σ = 2018123856. Its totient is φ = 1313381536.

The previous prime is 1661748377. The next prime is 1661748437. The reversal of 1661748395 is 5938471661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661748395 - 2¹⁴ = 1661732011 is a prime.

It is a super-2 number, since 2×1661748395² = 5522815456570152050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2001692 + ... + 2002521.

It is an arithmetic number, because the mean of its divisors is an integer number (252265482).

Almost surely, 2^1661748395 is an apocalyptic number.

1661748395 is a deficient number, since it is larger than the sum of its proper divisors (356375461).

1661748395 is an equidigital number, since it uses as much as digits as its factorization.

1661748395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004301.

The product of its digits is 1088640, while the sum is 50.

The square root of 1661748395 is about 40764.5482619396. The cubic root of 1661748395 is about 1184.4637012535.

The spelling of 1661748395 in words is "one billion, six hundred sixty-one million, seven hundred forty-eight thousand, three hundred ninety-five".