663742308637 has 4 divisors (see below), whose sum is σ = 663748426336. Its totient is φ = 663736190940.

The previous prime is 663742308517. The next prime is 663742308643. The reversal of 663742308637 is 736803247366.

663742308637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 736803247366 = 2 ⋅368401623683.

It is a cyclic number.

It is not a de Polignac number, because 663742308637 - 2¹⁵ = 663742275869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663742308667) 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, 2893113 + ... + 3114094.

It is an arithmetic number, because the mean of its divisors is an integer number (165937106584).

Almost surely, 2^663742308637 is an apocalyptic number.

It is an amenable number.

663742308637 is a deficient number, since it is larger than the sum of its proper divisors (6117699).

663742308637 is a wasteful number, since it uses less digits than its factorization.

663742308637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6117698.

The product of its (nonzero) digits is 18289152, while the sum is 55.

The spelling of 663742308637 in words is "six hundred sixty-three billion, seven hundred forty-two million, three hundred eight thousand, six hundred thirty-seven".