660420189 has 32 divisors (see below), whose sum is σ = 1149456000. Its totient is φ = 369463680.

The previous prime is 660420151. The next prime is 660420197. The reversal of 660420189 is 981024066.

It is not a de Polignac number, because 660420189 - 2¹⁷ = 660289117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660420109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81664 + ... + 89385.

It is an arithmetic number, because the mean of its divisors is an integer number (35920500).

Almost surely, 2^660420189 is an apocalyptic number.

It is an amenable number.

660420189 is a deficient number, since it is larger than the sum of its proper divisors (489035811).

660420189 is a wasteful number, since it uses less digits than its factorization.

660420189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171082 (or 171076 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 660420189 is about 25698.6417734479. The cubic root of 660420189 is about 870.8434982221.

The spelling of 660420189 in words is "six hundred sixty million, four hundred twenty thousand, one hundred eighty-nine".