966718521 has 6 divisors (see below), whose sum is σ = 1396371210. Its totient is φ = 644479008.

The previous prime is 966718457. The next prime is 966718553. The reversal of 966718521 is 125817669.

It can be written as a sum of positive squares in only one way, i.e., 909927225 + 56791296 = 30165^2 + 7536^2 .

It is not a de Polignac number, because 966718521 - 2⁶ = 966718457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (966718121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53706576 + ... + 53706593.

It is an arithmetic number, because the mean of its divisors is an integer number (232728535).

Almost surely, 2^966718521 is an apocalyptic number.

It is an amenable number.

966718521 is a deficient number, since it is larger than the sum of its proper divisors (429652689).

966718521 is a wasteful number, since it uses less digits than its factorization.

966718521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107413175 (or 107413172 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 966718521 is about 31092.0974043245. The cubic root of 966718521 is about 988.7807733452.

The spelling of 966718521 in words is "nine hundred sixty-six million, seven hundred eighteen thousand, five hundred twenty-one".