61665505002 has 24 divisors (see below), whose sum is σ = 134834365380. Its totient is φ = 20366588160.

The previous prime is 61665505001. The next prime is 61665505003. The reversal of 61665505002 is 20050556616.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61665505001) and next prime (61665505003).

It can be written as a sum of positive squares in 2 ways, for example, as 59301503361 + 2364001641 = 243519^2 + 48621^2 .

It is not an unprimeable number, because it can be changed into a prime (61665505001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15712999 + ... + 15716922.

Almost surely, 2^61665505002 is an apocalyptic number.

61665505002 is an abundant number, since it is smaller than the sum of its proper divisors (73168860378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61665505002 is a wasteful number, since it uses less digits than its factorization.

61665505002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430038 (or 31430035 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 61665505002 in words is "sixty-one billion, six hundred sixty-five million, five hundred five thousand, two".