1345245661 has 4 divisors (see below), whose sum is σ = 1352289024. Its totient is φ = 1338202300.

The previous prime is 1345245659. The next prime is 1345245673. The reversal of 1345245661 is 1665425431.

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.

It is a cyclic number.

It is not a de Polignac number, because 1345245661 - 2¹ = 1345245659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1345245661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345245641) 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, 3521395 + ... + 3521776.

It is an arithmetic number, because the mean of its divisors is an integer number (338072256).

Almost surely, 2^1345245661 is an apocalyptic number.

It is an amenable number.

1345245661 is a deficient number, since it is larger than the sum of its proper divisors (7043363).

1345245661 is an equidigital number, since it uses as much as digits as its factorization.

1345245661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043362.

The product of its digits is 86400, while the sum is 37.

The square root of 1345245661 is about 36677.5907196751. The cubic root of 1345245661 is about 1103.9105061728.

It can be divided in two parts, 134524 and 5661, that added together give a triangular number (140185 = T₅₂₉).

The spelling of 1345245661 in words is "one billion, three hundred forty-five million, two hundred forty-five thousand, six hundred sixty-one".