1663796918045 has 18 divisors (see below), whose sum is σ = 2004147529182. Its totient is φ = 1325995839216.

The previous prime is 1663796918029. The next prime is 1663796918053. The reversal of 1663796918045 is 5408196973661.

It can be written as a sum of positive squares in only one way, i.e., 1331037534436 + 332759383609 = 1153706^2 + 576853^2 .

It is not a de Polignac number, because 1663796918045 - 2⁴ = 1663796918029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 885468416 + ... + 885470294.

It is an arithmetic number, because the mean of its divisors is an integer number (111341529399).

Almost surely, 2^{1663796918045} is an apocalyptic number.

It is an amenable number.

1663796918045 is a deficient number, since it is larger than the sum of its proper divisors (340350611137).

1663796918045 is an frugal number, since it uses more digits than its factorization.

1663796918045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377 (or 2191 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 65.

The spelling of 1663796918045 in words is "one trillion, six hundred sixty-three billion, seven hundred ninety-six million, nine hundred eighteen thousand, forty-five".