1660157553599 has 4 divisors (see below), whose sum is σ = 1660438799136. Its totient is φ = 1659876308064.

The previous prime is 1660157553569. The next prime is 1660157553619. The reversal of 1660157553599 is 9953557510661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660157553599 is a prime.

It is a super-2 number, since 2×1660157553599² (a number of 25 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 (1660157553569) 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, 140613914 + ... + 140625719.

It is an arithmetic number, because the mean of its divisors is an integer number (415109699784).

Almost surely, 2^{1660157553599} is an apocalyptic number.

1660157553599 is a deficient number, since it is larger than the sum of its proper divisors (281245537).

1660157553599 is an equidigital number, since it uses as much as digits as its factorization.

1660157553599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281245536.

The product of its (nonzero) digits is 38272500, while the sum is 62.

The spelling of 1660157553599 in words is "one trillion, six hundred sixty billion, one hundred fifty-seven million, five hundred fifty-three thousand, five hundred ninety-nine".