145847661 has 4 divisors (see below), whose sum is σ = 194463552. Its totient is φ = 97231772.

The previous prime is 145847659. The next prime is 145847687. The reversal of 145847661 is 166748541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145847661 - 2¹ = 145847659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145847621) 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, 24307941 + ... + 24307946.

It is an arithmetic number, because the mean of its divisors is an integer number (48615888).

Almost surely, 2^145847661 is an apocalyptic number.

It is an amenable number.

145847661 is a deficient number, since it is larger than the sum of its proper divisors (48615891).

145847661 is an equidigital number, since it uses as much as digits as its factorization.

145847661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48615890.

The product of its digits is 161280, while the sum is 42.

The square root of 145847661 is about 12076.7404956801. The cubic root of 145847661 is about 526.3805370868.

The spelling of 145847661 in words is "one hundred forty-five million, eight hundred forty-seven thousand, six hundred sixty-one".