1326616601 has 4 divisors (see below), whose sum is σ = 1327227600. Its totient is φ = 1326005604.

The previous prime is 1326616579. The next prime is 1326616631. The reversal of 1326616601 is 1066166231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1066166231 = 13 ⋅82012787.

It is a cyclic number.

It is not a de Polignac number, because 1326616601 - 2²⁶ = 1259507737 is a prime.

It is a super-4 number, since 4×1326616601⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1326616631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302231 + ... + 306588.

It is an arithmetic number, because the mean of its divisors is an integer number (331806900).

Almost surely, 2^1326616601 is an apocalyptic number.

It is an amenable number.

1326616601 is a deficient number, since it is larger than the sum of its proper divisors (610999).

1326616601 is an equidigital number, since it uses as much as digits as its factorization.

1326616601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610998.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1326616601 is about 36422.7483998668. The cubic root of 1326616601 is about 1098.7911240245.

The spelling of 1326616601 in words is "one billion, three hundred twenty-six million, six hundred sixteen thousand, six hundred one".