1445626661 has 4 divisors (see below), whose sum is σ = 1446405324. Its totient is φ = 1444848000.

The previous prime is 1445626643. The next prime is 1445626697. The reversal of 1445626661 is 1666265441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 666156100 + 779470561 = 25810^2 + 27919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445626661 - 2²² = 1441432357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445626261) 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 3 ways as a sum of consecutive naturals, for example, 386540 + ... + 390261.

It is an arithmetic number, because the mean of its divisors is an integer number (361601331).

Almost surely, 2^1445626661 is an apocalyptic number.

It is an amenable number.

1445626661 is a deficient number, since it is larger than the sum of its proper divisors (778663).

1445626661 is an equidigital number, since it uses as much as digits as its factorization.

1445626661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778662.

The product of its digits is 207360, while the sum is 41.

The square root of 1445626661 is about 38021.3974098796. The cubic root of 1445626661 is about 1130.7121261101.

The spelling of 1445626661 in words is "one billion, four hundred forty-five million, six hundred twenty-six thousand, six hundred sixty-one".