667462431721 has 4 divisors (see below), whose sum is σ = 696482537472. Its totient is φ = 638442325972.

The previous prime is 667462431683. The next prime is 667462431737. The reversal of 667462431721 is 127134264766.

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.

It is a cyclic number.

It is not a de Polignac number, because 667462431721 - 2³¹ = 665314948073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667462431751) 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, 14510052841 + ... + 14510052886.

It is an arithmetic number, because the mean of its divisors is an integer number (174120634368).

Almost surely, 2^667462431721 is an apocalyptic number.

It is an amenable number.

667462431721 is a deficient number, since it is larger than the sum of its proper divisors (29020105751).

667462431721 is a wasteful number, since it uses less digits than its factorization.

667462431721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29020105750.

The product of its digits is 2032128, while the sum is 49.

The spelling of 667462431721 in words is "six hundred sixty-seven billion, four hundred sixty-two million, four hundred thirty-one thousand, seven hundred twenty-one".