423187756661 has 8 divisors (see below), whose sum is σ = 431207583000. Its totient is φ = 415228004352.

The previous prime is 423187756643. The next prime is 423187756727. The reversal of 423187756661 is 166657781324.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 76701302500 + 346486454161 = 276950^2 + 588631^2 .

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 423187756661 - 2¹⁰ = 423187755637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423187756597 and 423187756606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423187756631) 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, 15004286 + ... + 15032463.

It is an arithmetic number, because the mean of its divisors is an integer number (53900947875).

Almost surely, 2^423187756661 is an apocalyptic number.

It is an amenable number.

423187756661 is a deficient number, since it is larger than the sum of its proper divisors (8019826339).

423187756661 is a wasteful number, since it uses less digits than its factorization.

423187756661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30037015.

The product of its digits is 10160640, while the sum is 56.

The spelling of 423187756661 in words is "four hundred twenty-three billion, one hundred eighty-seven million, seven hundred fifty-six thousand, six hundred sixty-one".