661654130 has 8 divisors (see below), whose sum is σ = 1190977452. Its totient is φ = 264661648.

The previous prime is 661654057. The next prime is 661654139. The reversal of 661654130 is 31456166.

It can be written as a sum of positive squares in 2 ways, for example, as 659513761 + 2140369 = 25681^2 + 1463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661654139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33082697 + ... + 33082716.

Almost surely, 2^661654130 is an apocalyptic number.

661654130 is a deficient number, since it is larger than the sum of its proper divisors (529323322).

661654130 is a wasteful number, since it uses less digits than its factorization.

661654130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66165420.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 661654130 is about 25722.6384727539. The cubic root of 661654130 is about 871.3855273526.

The spelling of 661654130 in words is "six hundred sixty-one million, six hundred fifty-four thousand, one hundred thirty".