1020660156515 has 4 divisors (see below), whose sum is σ = 1224792187824. Its totient is φ = 816528125208.

The previous prime is 1020660156499. The next prime is 1020660156539. The reversal of 1020660156515 is 5156510660201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1020660156515 - 2⁴ = 1020660156499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102066015647 + ... + 102066015656.

It is an arithmetic number, because the mean of its divisors is an integer number (306198046956).

Almost surely, 2^{1020660156515} is an apocalyptic number.

1020660156515 is a deficient number, since it is larger than the sum of its proper divisors (204132031309).

1020660156515 is an equidigital number, since it uses as much as digits as its factorization.

1020660156515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204132031308.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 1020660156515 in words is "one trillion, twenty billion, six hundred sixty million, one hundred fifty-six thousand, five hundred fifteen".