202023051561 has 16 divisors (see below), whose sum is σ = 308948037120. Its totient is φ = 130337452080.

The previous prime is 202023051557. The next prime is 202023051563. The reversal of 202023051561 is 165150320202.

It is a happy number.

202023051561 is a `hidden beast` number, since 2 + 0 + 20 + 2 + 30 + 51 + 561 = 666.

It is not a de Polignac number, because 202023051561 - 2² = 202023051557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (202023051563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120681990 + ... + 120683663.

It is an arithmetic number, because the mean of its divisors is an integer number (19309252320).

Almost surely, 2^202023051561 is an apocalyptic number.

It is an amenable number.

202023051561 is a deficient number, since it is larger than the sum of its proper divisors (106924985559).

202023051561 is a wasteful number, since it uses less digits than its factorization.

202023051561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241365693 (or 241365687 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 202023051561 its reverse (165150320202), we get a palindrome (367173371763).

The spelling of 202023051561 in words is "two hundred two billion, twenty-three million, fifty-one thousand, five hundred sixty-one".