166420400215215 has 16 divisors (see below), whose sum is σ = 266277088032768. Its totient is φ = 88756064218656.

The previous prime is 166420400215213. The next prime is 166420400215261. The reversal of 166420400215215 is 512512004024661.

It is not a de Polignac number, because 166420400215215 - 2¹ = 166420400215213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166420400215211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91731927 + ... + 93528536.

It is an arithmetic number, because the mean of its divisors is an integer number (16642318002048).

Almost surely, 2^{166420400215215} is an apocalyptic number.

166420400215215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166420400215215 is a deficient number, since it is larger than the sum of its proper divisors (99856687817553).

166420400215215 is a wasteful number, since it uses less digits than its factorization.

166420400215215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185320358.

The product of its (nonzero) digits is 115200, while the sum is 39.

Adding to 166420400215215 its reverse (512512004024661), we get a palindrome (678932404239876).

The spelling of 166420400215215 in words is "one hundred sixty-six trillion, four hundred twenty billion, four hundred million, two hundred fifteen thousand, two hundred fifteen".