661706001 has 24 divisors (see below), whose sum is σ = 1043565120. Its totient is φ = 400696800.

The previous prime is 661705987. The next prime is 661706041. The reversal of 661706001 is 100607166.

It is not a de Polignac number, because 661706001 - 2⁷ = 661705873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661706041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167236 + ... + 171146.

It is an arithmetic number, because the mean of its divisors is an integer number (43481880).

Almost surely, 2^661706001 is an apocalyptic number.

It is an amenable number.

661706001 is a deficient number, since it is larger than the sum of its proper divisors (381859119).

661706001 is a wasteful number, since it uses less digits than its factorization.

661706001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637 (or 5634 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 661706001 is about 25723.6467282538. The cubic root of 661706001 is about 871.4082977879.

The spelling of 661706001 in words is "six hundred sixty-one million, seven hundred six thousand, one".