661207031223 has 8 divisors (see below), whose sum is σ = 881613289200. Its totient is φ = 440802730368.

The previous prime is 661207031209. The next prime is 661207031297. The reversal of 661207031223 is 322130702166.

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

It is not a de Polignac number, because 661207031223 - 2²² = 661202836919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661207031623) 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, 740863 + ... + 1367951.

It is an arithmetic number, because the mean of its divisors is an integer number (110201661150).

Almost surely, 2^661207031223 is an apocalyptic number.

661207031223 is a deficient number, since it is larger than the sum of its proper divisors (220406257977).

661207031223 is a wasteful number, since it uses less digits than its factorization.

661207031223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978561.

The product of its (nonzero) digits is 18144, while the sum is 33.

Adding to 661207031223 its reverse (322130702166), we get a palindrome (983337733389).

The spelling of 661207031223 in words is "six hundred sixty-one billion, two hundred seven million, thirty-one thousand, two hundred twenty-three".