667720572037 has 8 divisors (see below), whose sum is σ = 696966298560. Its totient is φ = 638492712000.

The previous prime is 667720571971. The next prime is 667720572049. The reversal of 667720572037 is 730275027766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667720572037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667720572067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4390212 + ... + 4539757.

It is an arithmetic number, because the mean of its divisors is an integer number (87120787320).

Almost surely, 2^667720572037 is an apocalyptic number.

It is an amenable number.

667720572037 is a deficient number, since it is larger than the sum of its proper divisors (29245726523).

667720572037 is a wasteful number, since it uses less digits than its factorization.

667720572037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8933243.

The product of its (nonzero) digits is 5186160, while the sum is 52.

The spelling of 667720572037 in words is "six hundred sixty-seven billion, seven hundred twenty million, five hundred seventy-two thousand, thirty-seven".