1665441401 has 8 divisors (see below), whose sum is σ = 1804294464. Its totient is φ = 1528122960.

The previous prime is 1665441359. The next prime is 1665441457. The reversal of 1665441401 is 1041445661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1665441401 - 2¹⁴ = 1665425017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665461401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381395 + ... + 385736.

It is an arithmetic number, because the mean of its divisors is an integer number (225536808).

Almost surely, 2^1665441401 is an apocalyptic number.

It is an amenable number.

1665441401 is a deficient number, since it is larger than the sum of its proper divisors (138853063).

1665441401 is a wasteful number, since it uses less digits than its factorization.

1665441401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767311.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1665441401 is about 40809.8199089386. The cubic root of 1665441401 is about 1185.3404876528.

The spelling of 1665441401 in words is "one billion, six hundred sixty-five million, four hundred forty-one thousand, four hundred one".