212535432661 has 4 divisors (see below), whose sum is σ = 212633785324. Its totient is φ = 212437080000.

The previous prime is 212535432643. The next prime is 212535432689. The reversal of 212535432661 is 166234535212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144547477636 + 67987955025 = 380194^2 + 260745^2 .

It is a cyclic number.

It is not a de Polignac number, because 212535432661 - 2¹⁵ = 212535399893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212535432631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49173090 + ... + 49177411.

It is an arithmetic number, because the mean of its divisors is an integer number (53158446331).

Almost surely, 2^212535432661 is an apocalyptic number.

It is an amenable number.

212535432661 is a deficient number, since it is larger than the sum of its proper divisors (98352663).

212535432661 is an equidigital number, since it uses as much as digits as its factorization.

212535432661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98352662.

The product of its digits is 259200, while the sum is 40.

Adding to 212535432661 its reverse (166234535212), we get a palindrome (378769967873).

The spelling of 212535432661 in words is "two hundred twelve billion, five hundred thirty-five million, four hundred thirty-two thousand, six hundred sixty-one".