663400581601077 has 16 divisors (see below), whose sum is σ = 982822547376000. Its totient is φ = 442263962482272.

The previous prime is 663400581601061. The next prime is 663400581601099. The reversal of 663400581601077 is 770106185004366.

663400581601077 is a `hidden beast` number, since 6 + 6 + 3 + 40 + 0 + 581 + 6 + 0 + 10 + 7 + 7 = 666.

It is not a de Polignac number, because 663400581601077 - 2⁴ = 663400581601061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663400581601477) 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, 81949752 + ... + 89680337.

It is an arithmetic number, because the mean of its divisors is an integer number (61426409211000).

Almost surely, 2^{663400581601077} is an apocalyptic number.

It is an amenable number.

663400581601077 is a deficient number, since it is larger than the sum of its proper divisors (319421965774923).

663400581601077 is a wasteful number, since it uses less digits than its factorization.

663400581601077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171773257 (or 171773251 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 663400581601077 in words is "six hundred sixty-three trillion, four hundred billion, five hundred eighty-one million, six hundred one thousand, seventy-seven".