1663350630781 has 8 divisors (see below), whose sum is σ = 1900994118464. Its totient is φ = 1425712635360.

The previous prime is 1663350630763. The next prime is 1663350630793. The reversal of 1663350630781 is 1870360533661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663350630781 is a prime.

It is a super-2 number, since 2×1663350630781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663350630731) 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, 702240 + ... + 1954441.

It is an arithmetic number, because the mean of its divisors is an integer number (237624264808).

Almost surely, 2^{1663350630781} is an apocalyptic number.

It is an amenable number.

1663350630781 is a deficient number, since it is larger than the sum of its proper divisors (237643487683).

1663350630781 is an equidigital number, since it uses as much as digits as its factorization.

1663350630781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746131.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 1663350630781 in words is "one trillion, six hundred sixty-three billion, three hundred fifty million, six hundred thirty thousand, seven hundred eighty-one".