245212536661 has 4 divisors (see below), whose sum is σ = 245214769824. Its totient is φ = 245210303500.

The previous prime is 245212536643. The next prime is 245212536689. The reversal of 245212536661 is 166635212542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 245212536661 - 2¹¹ = 245212534613 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 (245212536641) 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 in 3 ways as a sum of consecutive naturals, for example, 942865 + ... + 1174486.

It is an arithmetic number, because the mean of its divisors is an integer number (61303692456).

Almost surely, 2^245212536661 is an apocalyptic number.

It is an amenable number.

245212536661 is a deficient number, since it is larger than the sum of its proper divisors (2233163).

245212536661 is a wasteful number, since it uses less digits than its factorization.

245212536661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233162.

The product of its digits is 518400, while the sum is 43.

The spelling of 245212536661 in words is "two hundred forty-five billion, two hundred twelve million, five hundred thirty-six thousand, six hundred sixty-one".