145511661 has 4 divisors (see below), whose sum is σ = 194015552. Its totient is φ = 97007772.

The previous prime is 145511651. The next prime is 145511669. The reversal of 145511661 is 166115541.

145511661 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166115541 = 3 ⋅55371847.

It is not a de Polignac number, because 145511661 - 2⁵ = 145511629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145511669) 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, 24251941 + ... + 24251946.

It is an arithmetic number, because the mean of its divisors is an integer number (48503888).

Almost surely, 2^145511661 is an apocalyptic number.

It is an amenable number.

145511661 is a deficient number, since it is larger than the sum of its proper divisors (48503891).

145511661 is an equidigital number, since it uses as much as digits as its factorization.

145511661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48503890.

The product of its digits is 3600, while the sum is 30.

The square root of 145511661 is about 12062.8214361318. The cubic root of 145511661 is about 525.9760057390.

The spelling of 145511661 in words is "one hundred forty-five million, five hundred eleven thousand, six hundred sixty-one".