201615212312 has 8 divisors (see below), whose sum is σ = 378028523100. Its totient is φ = 100807606152.

The previous prime is 201615212287. The next prime is 201615212317. The reversal of 201615212312 is 213212516102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×201615212312² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201615212317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12600950762 + ... + 12600950777.

Almost surely, 2^201615212312 is an apocalyptic number.

It is an amenable number.

201615212312 is a deficient number, since it is larger than the sum of its proper divisors (176413310788).

201615212312 is a wasteful number, since it uses less digits than its factorization.

201615212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25201901545 (or 25201901541 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 201615212312 its reverse (213212516102), we get a palindrome (414827728414).

The spelling of 201615212312 in words is "two hundred one billion, six hundred fifteen million, two hundred twelve thousand, three hundred twelve".