167656399981 has 16 divisors (see below), whose sum is σ = 192400548480. Its totient is φ = 143110840320.

The previous prime is 167656399979. The next prime is 167656400011. The reversal of 167656399981 is 189993656761.

It is not a de Polignac number, because 167656399981 - 2¹ = 167656399979 is a prime.

It is a super-2 number, since 2×167656399981² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 167656399981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167656399081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9362046 + ... + 9379936.

It is an arithmetic number, because the mean of its divisors is an integer number (12025034280).

Almost surely, 2^167656399981 is an apocalyptic number.

It is an amenable number.

167656399981 is a deficient number, since it is larger than the sum of its proper divisors (24744148499).

167656399981 is a wasteful number, since it uses less digits than its factorization.

167656399981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23364.

The product of its digits is 132269760, while the sum is 70.

The spelling of 167656399981 in words is "one hundred sixty-seven billion, six hundred fifty-six million, three hundred ninety-nine thousand, nine hundred eighty-one".