661307007 has 8 divisors (see below), whose sum is σ = 882017584. Its totient is φ = 440733888.

The previous prime is 661306991. The next prime is 661307029. The reversal of 661307007 is 700703166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661307007 - 2⁴ = 661306991 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 (661307047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22558 + ... + 42795.

It is an arithmetic number, because the mean of its divisors is an integer number (110252198).

Almost surely, 2^661307007 is an apocalyptic number.

661307007 is a deficient number, since it is larger than the sum of its proper divisors (220710577).

661307007 is a wasteful number, since it uses less digits than its factorization.

661307007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68729.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 661307007 is about 25715.8901654211. The cubic root of 661307007 is about 871.2331159661.

It can be divided in two parts, 66130 and 7007, that added together give a palindrome (73137).

The spelling of 661307007 in words is "six hundred sixty-one million, three hundred seven thousand, seven".