145821667 has 4 divisors (see below), whose sum is σ = 146015056. Its totient is φ = 145628280.

The previous prime is 145821653. The next prime is 145821677. The reversal of 145821667 is 766128541.

145821667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766128541 = 3833 ⋅199877.

It is a cyclic number.

It is not a de Polignac number, because 145821667 - 2⁷ = 145821539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145821647) 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, 95559 + ... + 97072.

It is an arithmetic number, because the mean of its divisors is an integer number (36503764).

Almost surely, 2^145821667 is an apocalyptic number.

145821667 is a deficient number, since it is larger than the sum of its proper divisors (193389).

145821667 is an equidigital number, since it uses as much as digits as its factorization.

145821667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193388.

The product of its digits is 80640, while the sum is 40.

The square root of 145821667 is about 12075.6642467402. The cubic root of 145821667 is about 526.3492634768.

The spelling of 145821667 in words is "one hundred forty-five million, eight hundred twenty-one thousand, six hundred sixty-seven".