652015561621 has 4 divisors (see below), whose sum is σ = 652029988492. Its totient is φ = 652001134752.

The previous prime is 652015561609. The next prime is 652015561693. The reversal of 652015561621 is 126165510256.

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 508233539025 + 143782022596 = 712905^2 + 379186^2 .

It is a cyclic number.

It is not a de Polignac number, because 652015561621 - 2²¹ = 652013464469 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 (652015568621) 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, 7145430 + ... + 7236103.

It is an arithmetic number, because the mean of its divisors is an integer number (163007497123).

Almost surely, 2^652015561621 is an apocalyptic number.

It is an amenable number.

652015561621 is a deficient number, since it is larger than the sum of its proper divisors (14426871).

652015561621 is a wasteful number, since it uses less digits than its factorization.

652015561621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14426870.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 652015561621 in words is "six hundred fifty-two billion, fifteen million, five hundred sixty-one thousand, six hundred twenty-one".