145135661 has 16 divisors (see below), whose sum is σ = 167132160. Its totient is φ = 124645680.

The previous prime is 145135651. The next prime is 145135663. The reversal of 145135661 is 166531541.

It is a cyclic number.

It is not a de Polignac number, because 145135661 - 2²² = 140941357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145135663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96860 + ... + 98346.

It is an arithmetic number, because the mean of its divisors is an integer number (10445760).

Almost surely, 2^145135661 is an apocalyptic number.

145135661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145135661 is a deficient number, since it is larger than the sum of its proper divisors (21996499).

145135661 is a wasteful number, since it uses less digits than its factorization.

145135661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984.

The product of its digits is 10800, while the sum is 32.

The square root of 145135661 is about 12047.2262782767. The cubic root of 145135661 is about 525.5225768658.

The spelling of 145135661 in words is "one hundred forty-five million, one hundred thirty-five thousand, six hundred sixty-one".