660111748951 has 4 divisors (see below), whose sum is σ = 694854472600. Its totient is φ = 625369025304.

The previous prime is 660111748939. The next prime is 660111748957. The reversal of 660111748951 is 159847111066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660111748951 is a prime.

It is a super-2 number, since 2×660111748951² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660111748895 and 660111748904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660111748957) 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, 17371361796 + ... + 17371361833.

It is an arithmetic number, because the mean of its divisors is an integer number (173713618150).

Almost surely, 2^660111748951 is an apocalyptic number.

660111748951 is a deficient number, since it is larger than the sum of its proper divisors (34742723649).

660111748951 is a wasteful number, since it uses less digits than its factorization.

660111748951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34742723648.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 660111748951 in words is "six hundred sixty billion, one hundred eleven million, seven hundred forty-eight thousand, nine hundred fifty-one".