634137015720667 has 2 divisors, whose sum is σ = 634137015720668. Its totient is φ = 634137015720666.

The previous prime is 634137015720601. The next prime is 634137015720709. The reversal of 634137015720667 is 766027510731436.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634137015720667 - 2³¹ = 634134868237019 is a prime.

It is a super-2 number, since 2×634137015720667² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (634137015726667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317068507860333 + 317068507860334.

It is an arithmetic number, because the mean of its divisors is an integer number (317068507860334).

Almost surely, 2^{634137015720667} is an apocalyptic number.

634137015720667 is a deficient number, since it is larger than the sum of its proper divisors (1).

634137015720667 is an equidigital number, since it uses as much as digits as its factorization.

634137015720667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26671680, while the sum is 58.

The spelling of 634137015720667 in words is "six hundred thirty-four trillion, one hundred thirty-seven billion, fifteen million, seven hundred twenty thousand, six hundred sixty-seven".