663660423036451 has 4 divisors (see below), whose sum is σ = 666437244890400. Its totient is φ = 660883601182504.

The previous prime is 663660423036397. The next prime is 663660423036539. The reversal of 663660423036451 is 154630324066366.

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 663660423036451 - 2¹⁹ = 663660422512163 is a prime.

It is a super-2 number, since 2×663660423036451² (a number of 30 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 = 663660423036392 and 663660423036401.

It is not an unprimeable number, because it can be changed into a prime (663660423036851) 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, 1388410926616 + ... + 1388410927093.

It is an arithmetic number, because the mean of its divisors is an integer number (166609311222600).

Almost surely, 2^{663660423036451} is an apocalyptic number.

663660423036451 is a deficient number, since it is larger than the sum of its proper divisors (2776821853949).

663660423036451 is a wasteful number, since it uses less digits than its factorization.

663660423036451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776821853948.

The product of its (nonzero) digits is 33592320, while the sum is 55.

The spelling of 663660423036451 in words is "six hundred sixty-three trillion, six hundred sixty billion, four hundred twenty-three million, thirty-six thousand, four hundred fifty-one".