202145340661 has 4 divisors (see below), whose sum is σ = 220522189824. Its totient is φ = 183768491500.

The previous prime is 202145340659. The next prime is 202145340697. The reversal of 202145340661 is 166043541202.

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 not a de Polignac number, because 202145340661 - 2¹ = 202145340659 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 (202145341661) 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, 9188424565 + ... + 9188424586.

It is an arithmetic number, because the mean of its divisors is an integer number (55130547456).

Almost surely, 2^202145340661 is an apocalyptic number.

It is an amenable number.

202145340661 is a deficient number, since it is larger than the sum of its proper divisors (18376849163).

202145340661 is a wasteful number, since it uses less digits than its factorization.

202145340661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18376849162.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 202145340661 its reverse (166043541202), we get a palindrome (368188881863).

The spelling of 202145340661 in words is "two hundred two billion, one hundred forty-five million, three hundred forty thousand, six hundred sixty-one".