167981417021 has 16 divisors (see below), whose sum is σ = 187296841728. Its totient is φ = 149373932400.

The previous prime is 167981416979. The next prime is 167981417027. The reversal of 167981417021 is 120714189761.

It is not a de Polignac number, because 167981417021 - 2¹⁸ = 167981154877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167981417027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 747605 + ... + 945978.

It is an arithmetic number, because the mean of its divisors is an integer number (11706052608).

Almost surely, 2^167981417021 is an apocalyptic number.

167981417021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

167981417021 is a deficient number, since it is larger than the sum of its proper divisors (19315424707).

167981417021 is a wasteful number, since it uses less digits than its factorization.

167981417021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693792.

The product of its (nonzero) digits is 169344, while the sum is 47.

The spelling of 167981417021 in words is "one hundred sixty-seven billion, nine hundred eighty-one million, four hundred seventeen thousand, twenty-one".