215156020166 has 32 divisors (see below), whose sum is σ = 328943047680. Its totient is φ = 105525612864.

The previous prime is 215156020099. The next prime is 215156020171. The reversal of 215156020166 is 661020651512.

215156020166 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215156020166² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30807911 + ... + 30814893.

It is an arithmetic number, because the mean of its divisors is an integer number (10279470240).

Almost surely, 2^215156020166 is an apocalyptic number.

215156020166 is a deficient number, since it is larger than the sum of its proper divisors (113787027514).

215156020166 is a wasteful number, since it uses less digits than its factorization.

215156020166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8180.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 215156020166 its reverse (661020651512), we get a palindrome (876176671678).

The spelling of 215156020166 in words is "two hundred fifteen billion, one hundred fifty-six million, twenty thousand, one hundred sixty-six".