1669066465501 has 4 divisors (see below), whose sum is σ = 1714176370012. Its totient is φ = 1623956560992.

The previous prime is 1669066465441. The next prime is 1669066465513. The reversal of 1669066465501 is 1055646609661.

It is a happy number.

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 966143521476 + 702922944025 = 982926^2 + 838405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669066465501 - 2⁷ = 1669066465373 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 (1669066465571) 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, 22554952200 + ... + 22554952273.

It is an arithmetic number, because the mean of its divisors is an integer number (428544092503).

Almost surely, 2^{1669066465501} is an apocalyptic number.

It is an amenable number.

1669066465501 is a deficient number, since it is larger than the sum of its proper divisors (45109904511).

1669066465501 is an equidigital number, since it uses as much as digits as its factorization.

1669066465501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45109904510.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 1669066465501 in words is "one trillion, six hundred sixty-nine billion, sixty-six million, four hundred sixty-five thousand, five hundred one".