167649442637 has 4 divisors (see below), whose sum is σ = 167657585436. Its totient is φ = 167641299840.

The previous prime is 167649442607. The next prime is 167649442651. The reversal of 167649442637 is 736244946761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 736244946761 = 104677 ⋅7033493.

It can be written as a sum of positive squares in 2 ways, for example, as 100046322601 + 67603120036 = 316301^2 + 260006^2 .

It is a cyclic number.

It is not a de Polignac number, because 167649442637 - 2⁸ = 167649442381 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 (167649442607) 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, 4040438 + ... + 4081719.

It is an arithmetic number, because the mean of its divisors is an integer number (41914396359).

Almost surely, 2^167649442637 is an apocalyptic number.

It is an amenable number.

167649442637 is a deficient number, since it is larger than the sum of its proper divisors (8142799).

167649442637 is an equidigital number, since it uses as much as digits as its factorization.

167649442637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142798.

The product of its digits is 36578304, while the sum is 59.

The spelling of 167649442637 in words is "one hundred sixty-seven billion, six hundred forty-nine million, four hundred forty-two thousand, six hundred thirty-seven".