1661207714 has 4 divisors (see below), whose sum is σ = 2491811574. Its totient is φ = 830603856.

The previous prime is 1661207699. The next prime is 1661207747. The reversal of 1661207714 is 4177021661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4177021661 = 71 ⋅58831291.

It can be written as a sum of positive squares in only one way, i.e., 1620465025 + 40742689 = 40255^2 + 6383^2 .

It is a super-2 number, since 2×1661207714² = 5519222138106211592, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415301927 + ... + 415301930.

Almost surely, 2^1661207714 is an apocalyptic number.

1661207714 is a deficient number, since it is larger than the sum of its proper divisors (830603860).

1661207714 is an equidigital number, since it uses as much as digits as its factorization.

1661207714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830603859.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1661207714 is about 40757.9159673308. The cubic root of 1661207714 is about 1184.3352248267.

The spelling of 1661207714 in words is "one billion, six hundred sixty-one million, two hundred seven thousand, seven hundred fourteen".