663743907541 has 16 divisors (see below), whose sum is σ = 781519838400. Its totient is φ = 555747333120.

The previous prime is 663743907493. The next prime is 663743907551. The reversal of 663743907541 is 145709347366.

It is a cyclic number.

It is not a de Polignac number, because 663743907541 - 2¹³ = 663743899349 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 (663743907551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5104575 + ... + 5232988.

It is an arithmetic number, because the mean of its divisors is an integer number (48844989900).

Almost surely, 2^663743907541 is an apocalyptic number.

It is an amenable number.

663743907541 is a deficient number, since it is larger than the sum of its proper divisors (117775930859).

663743907541 is a wasteful number, since it uses less digits than its factorization.

663743907541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338036.

The product of its (nonzero) digits is 11430720, while the sum is 55.

The spelling of 663743907541 in words is "six hundred sixty-three billion, seven hundred forty-three million, nine hundred seven thousand, five hundred forty-one".