635128381403 has 2 divisors, whose sum is σ = 635128381404. Its totient is φ = 635128381402.

The previous prime is 635128381361. The next prime is 635128381421. The reversal of 635128381403 is 304183821536.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 635128381403 - 2²² = 635124187099 is a prime.

It is not a weakly prime, because it can be changed into another prime (635128381423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317564190701 + 317564190702.

It is an arithmetic number, because the mean of its divisors is an integer number (317564190702).

Almost surely, 2^635128381403 is an apocalyptic number.

635128381403 is a deficient number, since it is larger than the sum of its proper divisors (1).

635128381403 is an equidigital number, since it uses as much as digits as its factorization.

635128381403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 635128381403 in words is "six hundred thirty-five billion, one hundred twenty-eight million, three hundred eighty-one thousand, four hundred three".