667072651 has 4 divisors (see below), whose sum is σ = 762368752. Its totient is φ = 571776552.

The previous prime is 667072621. The next prime is 667072687. The reversal of 667072651 is 156270766.

It is a happy number.

667072651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667072651 - 2⁹ = 667072139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667072621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47648040 + ... + 47648053.

It is an arithmetic number, because the mean of its divisors is an integer number (190592188).

Almost surely, 2^667072651 is an apocalyptic number.

667072651 is a deficient number, since it is larger than the sum of its proper divisors (95296101).

667072651 is an equidigital number, since it uses as much as digits as its factorization.

667072651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95296100.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 667072651 is about 25827.7496309686. The cubic root of 667072651 is about 873.7577587432.

The spelling of 667072651 in words is "six hundred sixty-seven million, seventy-two thousand, six hundred fifty-one".