961666651 has 8 divisors (see below), whose sum is σ = 1085266800. Its totient is φ = 844095840.

The previous prime is 961666649. The next prime is 961666751. The reversal of 961666651 is 156666169.

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

It is a cyclic number.

It is not a de Polignac number, because 961666651 - 2¹ = 961666649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961666351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1506996 + ... + 1507633.

It is an arithmetic number, because the mean of its divisors is an integer number (135658350).

Almost surely, 2^961666651 is an apocalyptic number.

961666651 is a deficient number, since it is larger than the sum of its proper divisors (123600149).

961666651 is a wasteful number, since it uses less digits than its factorization.

961666651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014669.

The product of its digits is 349920, while the sum is 46.

The square root of 961666651 is about 31010.7505713744. The cubic root of 961666651 is about 987.0553767432.

It can be divided in two parts, 9616 and 66651, that added together give a palindrome (76267).

The spelling of 961666651 in words is "nine hundred sixty-one million, six hundred sixty-six thousand, six hundred fifty-one".