660921560701 has 4 divisors (see below), whose sum is σ = 661380854400. Its totient is φ = 660462267004.

The previous prime is 660921560687. The next prime is 660921560723. The reversal of 660921560701 is 107065129066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660921560701 - 2¹⁵ = 660921527933 is a prime.

It is a super-2 number, since 2×660921560701² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660921560771) 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, 229644691 + ... + 229647568.

It is an arithmetic number, because the mean of its divisors is an integer number (165345213600).

Almost surely, 2^660921560701 is an apocalyptic number.

It is an amenable number.

660921560701 is a deficient number, since it is larger than the sum of its proper divisors (459293699).

660921560701 is a wasteful number, since it uses less digits than its factorization.

660921560701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459293698.

The product of its (nonzero) digits is 136080, while the sum is 43.

Adding to 660921560701 its reverse (107065129066), we get a palindrome (767986689767).

The spelling of 660921560701 in words is "six hundred sixty billion, nine hundred twenty-one million, five hundred sixty thousand, seven hundred one".