1661322479 has 2 divisors, whose sum is σ = 1661322480. Its totient is φ = 1661322478.

The previous prime is 1661322469. The next prime is 1661322493. The reversal of 1661322479 is 9742231661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661322479 - 2⁴ = 1661322463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661322469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830661239 + 830661240.

It is an arithmetic number, because the mean of its divisors is an integer number (830661240).

Almost surely, 2^1661322479 is an apocalyptic number.

1661322479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661322479 is an equidigital number, since it uses as much as digits as its factorization.

1661322479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 1661322479 is about 40759.3238290333. The cubic root of 1661322479 is about 1184.3624975755.

The spelling of 1661322479 in words is "one billion, six hundred sixty-one million, three hundred twenty-two thousand, four hundred seventy-nine".