660967776 has 144 divisors (see below), whose sum is σ = 2227889664. Its totient is φ = 188832384.

The previous prime is 660967759. The next prime is 660967777. The reversal of 660967776 is 677769066.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660967777) 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 23 ways as a sum of consecutive naturals, for example, 48361 + ... + 60503.

It is an arithmetic number, because the mean of its divisors is an integer number (15471456).

Almost surely, 2^660967776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660967776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113944832).

660967776 is an abundant number, since it is smaller than the sum of its proper divisors (1566921888).

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

660967776 is a wasteful number, since it uses less digits than its factorization.

660967776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12175 (or 12155 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 54.

The square root of 660967776 is about 25709.2935725585. The cubic root of 660967776 is about 871.0841181842.

The spelling of 660967776 in words is "six hundred sixty million, nine hundred sixty-seven thousand, seven hundred seventy-six".