667019493471621 has 8 divisors (see below), whose sum is σ = 889359512370784. Its totient is φ = 444679568443440.

The previous prime is 667019493471563. The next prime is 667019493471671. The reversal of 667019493471621 is 126174394910766.

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

It is not a de Polignac number, because 667019493471621 - 2⁷ = 667019493471493 is a prime.

It is a super-2 number, since 2×667019493471621² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667019493471671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4756510 + ... + 36832911.

It is an arithmetic number, because the mean of its divisors is an integer number (111169939046348).

Almost surely, 2^{667019493471621} is an apocalyptic number.

It is an amenable number.

667019493471621 is a deficient number, since it is larger than the sum of its proper divisors (222340018899163).

667019493471621 is a wasteful number, since it uses less digits than its factorization.

667019493471621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46935491.

The product of its (nonzero) digits is 82301184, while the sum is 66.

The spelling of 667019493471621 in words is "six hundred sixty-seven trillion, nineteen billion, four hundred ninety-three million, four hundred seventy-one thousand, six hundred twenty-one".