1665634660455 has 16 divisors (see below), whose sum is σ = 2702550887424. Its totient is φ = 875826675360.

The previous prime is 1665634660441. The next prime is 1665634660511. The reversal of 1665634660455 is 5540664365661.

It is not a de Polignac number, because 1665634660455 - 2⁴ = 1665634660439 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1665634660395 and 1665634660404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781987039 + ... + 781989168.

It is an arithmetic number, because the mean of its divisors is an integer number (168909430464).

Almost surely, 2^{1665634660455} is an apocalyptic number.

1665634660455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665634660455 is a deficient number, since it is larger than the sum of its proper divisors (1036916226969).

1665634660455 is a wasteful number, since it uses less digits than its factorization.

1665634660455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563976286.

The product of its (nonzero) digits is 46656000, while the sum is 57.

The spelling of 1665634660455 in words is "one trillion, six hundred sixty-five billion, six hundred thirty-four million, six hundred sixty thousand, four hundred fifty-five".