667216061831 has 4 divisors (see below), whose sum is σ = 727872067464. Its totient is φ = 606560056200.

The previous prime is 667216061821. The next prime is 667216061851. The reversal of 667216061831 is 138160612766.

667216061831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667216061831 - 2⁶ = 667216061767 is a prime.

It is a super-2 number, since 2×667216061831² (a number of 24 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 (667216061821) 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, 30328002800 + ... + 30328002821.

It is an arithmetic number, because the mean of its divisors is an integer number (181968016866).

Almost surely, 2^667216061831 is an apocalyptic number.

667216061831 is a deficient number, since it is larger than the sum of its proper divisors (60656005633).

667216061831 is a wasteful number, since it uses less digits than its factorization.

667216061831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60656005632.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 667216061831 in words is "six hundred sixty-seven billion, two hundred sixteen million, sixty-one thousand, eight hundred thirty-one".