180077661 has 20 divisors (see below), whose sum is σ = 269541052. Its totient is φ = 119812608.

The previous prime is 180077621. The next prime is 180077669. The reversal of 180077661 is 166770081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 178623225 + 1454436 = 13365^2 + 1206^2 .

It is not a de Polignac number, because 180077661 - 2¹⁹ = 179553373 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 (180077669) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44811 + ... + 48663.

Almost surely, 2^180077661 is an apocalyptic number.

It is an amenable number.

180077661 is a deficient number, since it is larger than the sum of its proper divisors (89463391).

180077661 is an equidigital number, since it uses as much as digits as its factorization.

180077661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442 (or 4433 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 180077661 is about 13419.3018074712. The cubic root of 180077661 is about 564.7028076521.

The spelling of 180077661 in words is "one hundred eighty million, seventy-seven thousand, six hundred sixty-one".