145821669 has 8 divisors (see below), whose sum is σ = 222204480. Its totient is φ = 83326656.

The previous prime is 145821653. The next prime is 145821677. The reversal of 145821669 is 966128541.

145821669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 145821669 - 2⁴ = 145821653 is a prime.

It is a super-2 number, since 2×145821669² = 42527918299891122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145821669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145821619) 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, 3471924 + ... + 3471965.

It is an arithmetic number, because the mean of its divisors is an integer number (27775560).

Almost surely, 2^145821669 is an apocalyptic number.

It is an amenable number.

145821669 is a deficient number, since it is larger than the sum of its proper divisors (76382811).

145821669 is an equidigital number, since it uses as much as digits as its factorization.

145821669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6943899.

The product of its digits is 103680, while the sum is 42.

The square root of 145821669 is about 12075.6643295514. The cubic root of 145821669 is about 526.3492658831.

The spelling of 145821669 in words is "one hundred forty-five million, eight hundred twenty-one thousand, six hundred sixty-nine".