660155555001 has 4 divisors (see below), whose sum is σ = 880207406672. Its totient is φ = 440103703332.

The previous prime is 660155554997. The next prime is 660155555011. The reversal of 660155555001 is 100555551066.

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 not a de Polignac number, because 660155555001 - 2² = 660155554997 is a prime.

It is a super-2 number, since 2×660155555001² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660155555011) 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, 110025925831 + ... + 110025925836.

It is an arithmetic number, because the mean of its divisors is an integer number (220051851668).

Almost surely, 2^660155555001 is an apocalyptic number.

It is an amenable number.

660155555001 is a deficient number, since it is larger than the sum of its proper divisors (220051851671).

660155555001 is a wasteful number, since it uses less digits than its factorization.

660155555001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220051851670.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 660155555001 in words is "six hundred sixty billion, one hundred fifty-five million, five hundred fifty-five thousand, one".