1660613057081 has 4 divisors (see below), whose sum is σ = 1811577880464. Its totient is φ = 1509648233700.

The previous prime is 1660613057069. The next prime is 1660613057099. The reversal of 1660613057081 is 1807503160661.

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 a de Polignac number, because none of the positive numbers 2^k-1660613057081 is a prime.

It is a super-2 number, since 2×1660613057081² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1660613057021) 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, 75482411675 + ... + 75482411696.

It is an arithmetic number, because the mean of its divisors is an integer number (452894470116).

Almost surely, 2^{1660613057081} is an apocalyptic number.

1660613057081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1660613057081 is a deficient number, since it is larger than the sum of its proper divisors (150964823383).

1660613057081 is a wasteful number, since it uses less digits than its factorization.

1660613057081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150964823382.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 1660613057081 in words is "one trillion, six hundred sixty billion, six hundred thirteen million, fifty-seven thousand, eighty-one".