667670745481 has 4 divisors (see below), whose sum is σ = 696699908352. Its totient is φ = 638641582612.

The previous prime is 667670745479. The next prime is 667670745491. The reversal of 667670745481 is 184547076766.

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 667670745481 - 2¹ = 667670745479 is a prime.

It is a super-2 number, since 2×667670745481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667670745451) 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, 14514581401 + ... + 14514581446.

It is an arithmetic number, because the mean of its divisors is an integer number (174174977088).

Almost surely, 2^667670745481 is an apocalyptic number.

It is an amenable number.

667670745481 is a deficient number, since it is larger than the sum of its proper divisors (29029162871).

667670745481 is a wasteful number, since it uses less digits than its factorization.

667670745481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29029162870.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 667670745481 in words is "six hundred sixty-seven billion, six hundred seventy million, seven hundred forty-five thousand, four hundred eighty-one".