137878021670491 has 2 divisors, whose sum is σ = 137878021670492. Its totient is φ = 137878021670490.

The previous prime is 137878021670387. The next prime is 137878021670513. The reversal of 137878021670491 is 194076120878731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 137878021670491 - 2⁹ = 137878021669979 is a prime.

It is not a weakly prime, because it can be changed into another prime (137878021670791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68939010835245 + 68939010835246.

It is an arithmetic number, because the mean of its divisors is an integer number (68939010835246).

Almost surely, 2^{137878021670491} is an apocalyptic number.

137878021670491 is a deficient number, since it is larger than the sum of its proper divisors (1).

137878021670491 is an equidigital number, since it uses as much as digits as its factorization.

137878021670491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 137878021670491 in words is "one hundred thirty-seven trillion, eight hundred seventy-eight billion, twenty-one million, six hundred seventy thousand, four hundred ninety-one".