215661106146 has 96 divisors (see below), whose sum is σ = 461673537408. Its totient is φ = 67144723200.

The previous prime is 215661106121. The next prime is 215661106147. The reversal of 215661106146 is 641601166512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (215661106147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44805636 + ... + 44810448.

It is an arithmetic number, because the mean of its divisors is an integer number (4809099348).

Almost surely, 2^215661106146 is an apocalyptic number.

215661106146 is an abundant number, since it is smaller than the sum of its proper divisors (246012431262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215661106146 is a wasteful number, since it uses less digits than its factorization.

215661106146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144 (or 5125 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 215661106146 in words is "two hundred fifteen billion, six hundred sixty-one million, one hundred six thousand, one hundred forty-six".