668477761 has 8 divisors (see below), whose sum is σ = 764141504. Its totient is φ = 572855760.

The previous prime is 668477759. The next prime is 668477807. The reversal of 668477761 is 167774866.

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 668477761 - 2¹ = 668477759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668477699 and 668477708.

It is not an unprimeable number, because it can be changed into a prime (668477461) 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 7 ways as a sum of consecutive naturals, for example, 40426 + ... + 54508.

It is an arithmetic number, because the mean of its divisors is an integer number (95517688).

Almost surely, 2^668477761 is an apocalyptic number.

It is an amenable number.

668477761 is a deficient number, since it is larger than the sum of its proper divisors (95663743).

668477761 is a wasteful number, since it uses less digits than its factorization.

668477761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20871.

The product of its digits is 2370816, while the sum is 52.

The square root of 668477761 is about 25854.9368786698. The cubic root of 668477761 is about 874.3708177805.

The spelling of 668477761 in words is "six hundred sixty-eight million, four hundred seventy-seven thousand, seven hundred sixty-one".