212661011615 has 32 divisors (see below), whose sum is σ = 278150011776. Its totient is φ = 155150069760.

The previous prime is 212661011609. The next prime is 212661011627. The reversal of 212661011615 is 516110166212.

It is not a de Polignac number, because 212661011615 - 2¹² = 212661007519 is a prime.

It is a super-2 number, since 2×212661011615² (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 31 ways as a sum of consecutive naturals, for example, 2237747 + ... + 2330843.

It is an arithmetic number, because the mean of its divisors is an integer number (8692187868).

Almost surely, 2^212661011615 is an apocalyptic number.

212661011615 is a deficient number, since it is larger than the sum of its proper divisors (65489000161).

212661011615 is a wasteful number, since it uses less digits than its factorization.

212661011615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93539.

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 212661011615 its reverse (516110166212), we get a palindrome (728771177827).

The spelling of 212661011615 in words is "two hundred twelve billion, six hundred sixty-one million, eleven thousand, six hundred fifteen".