145773661 has 6 divisors (see below), whose sum is σ = 160230686. Its totient is φ = 132521400.

The previous prime is 145773619. The next prime is 145773679. The reversal of 145773661 is 166377541.

It can be written as a sum of positive squares in only one way, i.e., 143760100 + 2013561 = 11990^2 + 1419^2 .

It is not a de Polignac number, because 145773661 - 2⁷ = 145773533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145773611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602250 + ... + 602491.

Almost surely, 2^145773661 is an apocalyptic number.

145773661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145773661 is a deficient number, since it is larger than the sum of its proper divisors (14457025).

145773661 is a wasteful number, since it uses less digits than its factorization.

145773661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204763 (or 1204752 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 145773661 is about 12073.6763663766. The cubic root of 145773661 is about 526.2914972646.

The spelling of 145773661 in words is "one hundred forty-five million, seven hundred seventy-three thousand, six hundred sixty-one".