145651645 has 4 divisors (see below), whose sum is σ = 174781980. Its totient is φ = 116521312.

The previous prime is 145651643. The next prime is 145651661. The reversal of 145651645 is 546156541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546156541 = 7 ⋅78022363.

It can be written as a sum of positive squares in 2 ways, for example, as 43520409 + 102131236 = 6597^2 + 10106^2 .

It is a cyclic number.

It is not a de Polignac number, because 145651645 - 2¹ = 145651643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145651643) 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, 14565160 + ... + 14565169.

It is an arithmetic number, because the mean of its divisors is an integer number (43695495).

Almost surely, 2^145651645 is an apocalyptic number.

It is an amenable number.

145651645 is a deficient number, since it is larger than the sum of its proper divisors (29130335).

145651645 is an equidigital number, since it uses as much as digits as its factorization.

145651645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29130334.

The product of its digits is 72000, while the sum is 37.

The square root of 145651645 is about 12068.6223323128. The cubic root of 145651645 is about 526.1446168017.

The spelling of 145651645 in words is "one hundred forty-five million, six hundred fifty-one thousand, six hundred forty-five".