667400340001 has 4 divisors (see below), whose sum is σ = 696417746112. Its totient is φ = 638382933892.

The previous prime is 667400339989. The next prime is 667400340011. The reversal of 667400340001 is 100043004766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100043004766 = 2 ⋅50021502383.

It is a cyclic number.

It is not a de Polignac number, because 667400340001 - 2¹³ = 667400331809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667400340011) 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, 14508703021 + ... + 14508703066.

It is an arithmetic number, because the mean of its divisors is an integer number (174104436528).

Almost surely, 2^667400340001 is an apocalyptic number.

It is an amenable number.

667400340001 is a deficient number, since it is larger than the sum of its proper divisors (29017406111).

667400340001 is a wasteful number, since it uses less digits than its factorization.

667400340001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29017406110.

The product of its (nonzero) digits is 12096, while the sum is 31.

Adding to 667400340001 its reverse (100043004766), we get a palindrome (767443344767).

The spelling of 667400340001 in words is "six hundred sixty-seven billion, four hundred million, three hundred forty thousand, one".