661366615130 has 32 divisors (see below), whose sum is σ = 1282088972304. Its totient is φ = 244186384896.

The previous prime is 661366615099. The next prime is 661366615139. The reversal of 661366615130 is 31516663166.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 383615480689 + 277751134441 = 619367^2 + 527021^2 .

It is not an unprimeable number, because it can be changed into a prime (661366615139) 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, 3334712 + ... + 3527468.

Almost surely, 2^661366615130 is an apocalyptic number.

661366615130 is a deficient number, since it is larger than the sum of its proper divisors (620722357174).

661366615130 is a wasteful number, since it uses less digits than its factorization.

661366615130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219170.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 661366615130 in words is "six hundred sixty-one billion, three hundred sixty-six million, six hundred fifteen thousand, one hundred thirty".