161227212015 has 64 divisors (see below), whose sum is σ = 270754099200. Its totient is φ = 81814946304.

The previous prime is 161227212001. The next prime is 161227212043. The reversal of 161227212015 is 510212722161.

It is a happy number.

It is not a de Polignac number, because 161227212015 - 2⁵ = 161227211983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19137094 + ... + 19145516.

It is an arithmetic number, because the mean of its divisors is an integer number (4230532800).

Almost surely, 2^161227212015 is an apocalyptic number.

161227212015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161227212015 is a deficient number, since it is larger than the sum of its proper divisors (109526887185).

161227212015 is a wasteful number, since it uses less digits than its factorization.

161227212015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9096.

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 161227212015 its reverse (510212722161), we get a palindrome (671439934176).

The spelling of 161227212015 in words is "one hundred sixty-one billion, two hundred twenty-seven million, two hundred twelve thousand, fifteen".