661740230245 has 8 divisors (see below), whose sum is σ = 794549162016. Its totient is φ = 529084927056.

The previous prime is 661740230237. The next prime is 661740230311. The reversal of 661740230245 is 542032047166.

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

It is a cyclic number.

It is not a de Polignac number, because 661740230245 - 2³ = 661740230237 is a prime.

It is a super-2 number, since 2×661740230245² (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 = 661740230198 and 661740230207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38397667 + ... + 38414896.

It is an arithmetic number, because the mean of its divisors is an integer number (99318645252).

Almost surely, 2^661740230245 is an apocalyptic number.

It is an amenable number.

661740230245 is a deficient number, since it is larger than the sum of its proper divisors (132808931771).

661740230245 is a wasteful number, since it uses less digits than its factorization.

661740230245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76814291.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 661740230245 in words is "six hundred sixty-one billion, seven hundred forty million, two hundred thirty thousand, two hundred forty-five".