1613506666553 has 4 divisors (see below), whose sum is σ = 1616063730048. Its totient is φ = 1610949603060.

The previous prime is 1613506666543. The next prime is 1613506666559. The reversal of 1613506666553 is 3556666053161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1613506666553 - 2⁴ = 1613506666537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1613506666495 and 1613506666504.

It is not an unprimeable number, because it can be changed into a prime (1613506666559) 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, 1278530801 + ... + 1278532062.

It is an arithmetic number, because the mean of its divisors is an integer number (404015932512).

Almost surely, 2^{1613506666553} is an apocalyptic number.

It is an amenable number.

1613506666553 is a deficient number, since it is larger than the sum of its proper divisors (2557063495).

1613506666553 is an equidigital number, since it uses as much as digits as its factorization.

1613506666553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557063494.

The product of its (nonzero) digits is 8748000, while the sum is 53.

The spelling of 1613506666553 in words is "one trillion, six hundred thirteen billion, five hundred six million, six hundred sixty-six thousand, five hundred fifty-three".