155664205663 has 4 divisors (see below), whose sum is σ = 159460893648. Its totient is φ = 151867517680.

The previous prime is 155664205661. The next prime is 155664205681. The reversal of 155664205663 is 366502466551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366502466551 = 13 ⋅28192497427.

It is a cyclic number.

It is not a de Polignac number, because 155664205663 - 2¹ = 155664205661 is a prime.

It is a super-2 number, since 2×155664205663² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155664205661) 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, 1898343931 + ... + 1898344012.

It is an arithmetic number, because the mean of its divisors is an integer number (39865223412).

Almost surely, 2^155664205663 is an apocalyptic number.

155664205663 is a deficient number, since it is larger than the sum of its proper divisors (3796687985).

155664205663 is an equidigital number, since it uses as much as digits as its factorization.

155664205663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796687984.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 155664205663 in words is "one hundred fifty-five billion, six hundred sixty-four million, two hundred five thousand, six hundred sixty-three".