67720107551 has 2 divisors, whose sum is σ = 67720107552. Its totient is φ = 67720107550.

The previous prime is 67720107493. The next prime is 67720107593. The reversal of 67720107551 is 15570102776.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67720107551 - 2⁶ = 67720107487 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 67720107499 and 67720107508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67720101551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860053775 + 33860053776.

It is an arithmetic number, because the mean of its divisors is an integer number (33860053776).

Almost surely, 2^67720107551 is an apocalyptic number.

67720107551 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720107551 is an equidigital number, since it uses as much as digits as its factorization.

67720107551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102900, while the sum is 41.

The spelling of 67720107551 in words is "sixty-seven billion, seven hundred twenty million, one hundred seven thousand, five hundred fifty-one".