145921801805 has 8 divisors (see below), whose sum is σ = 188575867032. Its totient is φ = 107757638208.

The previous prime is 145921801787. The next prime is 145921801811. The reversal of 145921801805 is 508108129541.

It can be written as a sum of positive squares in 4 ways, for example, as 8011324036 + 137910477769 = 89506^2 + 371363^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 145921801805 - 2¹⁰ = 145921800781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1122475334 + ... + 1122475463.

It is an arithmetic number, because the mean of its divisors is an integer number (23571983379).

Almost surely, 2^145921801805 is an apocalyptic number.

It is an amenable number.

145921801805 is a deficient number, since it is larger than the sum of its proper divisors (42654065227).

145921801805 is a wasteful number, since it uses less digits than its factorization.

145921801805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244950815.

The product of its (nonzero) digits is 115200, while the sum is 44.

The spelling of 145921801805 in words is "one hundred forty-five billion, nine hundred twenty-one million, eight hundred one thousand, eight hundred five".