668361651 has 16 divisors (see below), whose sum is σ = 938649600. Its totient is φ = 421854048.

The previous prime is 668361611. The next prime is 668361671. The reversal of 668361651 is 156163866.

It is not a de Polignac number, because 668361651 - 2¹⁷ = 668230579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668361611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125005 + ... + 130241.

It is an arithmetic number, because the mean of its divisors is an integer number (58665600).

Almost surely, 2^668361651 is an apocalyptic number.

668361651 is a deficient number, since it is larger than the sum of its proper divisors (270287949).

668361651 is a wasteful number, since it uses less digits than its factorization.

668361651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7498.

The product of its digits is 155520, while the sum is 42.

The square root of 668361651 is about 25852.6913685984. The cubic root of 668361651 is about 874.3201907788.

The spelling of 668361651 in words is "six hundred sixty-eight million, three hundred sixty-one thousand, six hundred fifty-one".