661111224671 has 4 divisors (see below), whose sum is σ = 661115754144. Its totient is φ = 661106695200.

The previous prime is 661111224667. The next prime is 661111224689. The reversal of 661111224671 is 176422111166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661111224671 - 2² = 661111224667 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 (661111224611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038250 + ... + 2340231.

It is an arithmetic number, because the mean of its divisors is an integer number (165278938536).

Almost surely, 2^661111224671 is an apocalyptic number.

661111224671 is a deficient number, since it is larger than the sum of its proper divisors (4529473).

661111224671 is a wasteful number, since it uses less digits than its factorization.

661111224671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4529472.

The product of its digits is 24192, while the sum is 38.

The spelling of 661111224671 in words is "six hundred sixty-one billion, one hundred eleven million, two hundred twenty-four thousand, six hundred seventy-one".