1661663235 has 16 divisors (see below), whose sum is σ = 2660334336. Its totient is φ = 885662688.

The previous prime is 1661663231. The next prime is 1661663279. The reversal of 1661663235 is 5323661661.

It is a happy number.

It is not a de Polignac number, because 1661663235 - 2² = 1661663231 is a prime.

It is a super-2 number, since 2×1661663235² = 5522249413101330450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661663193 and 1661663202.

It is not an unprimeable number, because it can be changed into a prime (1661663231) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9639 + ... + 58448.

It is an arithmetic number, because the mean of its divisors is an integer number (166270896).

Almost surely, 2^1661663235 is an apocalyptic number.

1661663235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661663235 is a deficient number, since it is larger than the sum of its proper divisors (998671101).

1661663235 is a wasteful number, since it uses less digits than its factorization.

1661663235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69722.

The product of its digits is 116640, while the sum is 39.

The square root of 1661663235 is about 40763.5037134935. The cubic root of 1661663235 is about 1184.4434674138.

The spelling of 1661663235 in words is "one billion, six hundred sixty-one million, six hundred sixty-three thousand, two hundred thirty-five".