661066065 has 48 divisors (see below), whose sum is σ = 1258545600. Its totient is φ = 318330240.

The previous prime is 661066057. The next prime is 661066067. The reversal of 661066065 is 560660166.

It is not a de Polignac number, because 661066065 - 2³ = 661066057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661066067) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69274 + ... + 78236.

It is an arithmetic number, because the mean of its divisors is an integer number (26219700).

Almost surely, 2^661066065 is an apocalyptic number.

It is an amenable number.

661066065 is a deficient number, since it is larger than the sum of its proper divisors (597479535).

661066065 is a wasteful number, since it uses less digits than its factorization.

661066065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9134 (or 9131 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 661066065 is about 25711.2050476052. The cubic root of 661066065 is about 871.1272941384.

The spelling of 661066065 in words is "six hundred sixty-one million, sixty-six thousand, sixty-five".