661406701 has 16 divisors (see below), whose sum is σ = 712800000. Its totient is φ = 611739648.

The previous prime is 661406689. The next prime is 661406737. The reversal of 661406701 is 107604166.

It is a cyclic number.

It is not a de Polignac number, because 661406701 - 2⁹ = 661406189 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 (661406401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528925 + ... + 530173.

It is an arithmetic number, because the mean of its divisors is an integer number (44550000).

Almost surely, 2^661406701 is an apocalyptic number.

It is an amenable number.

661406701 is a deficient number, since it is larger than the sum of its proper divisors (51393299).

661406701 is a wasteful number, since it uses less digits than its factorization.

661406701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 661406701 is about 25717.8284658717. The cubic root of 661406701 is about 871.2768940949.

The spelling of 661406701 in words is "six hundred sixty-one million, four hundred six thousand, seven hundred one".