634530105063551 has 4 divisors (see below), whose sum is σ = 634904017914432. Its totient is φ = 634156192212672.

The previous prime is 634530105063541. The next prime is 634530105063553. The reversal of 634530105063551 is 155360501035436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634530105063551 is a prime.

It is a super-2 number, since 2×634530105063551² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634530105063496 and 634530105063505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634530105063553) 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 in 3 ways as a sum of consecutive naturals, for example, 186956422895 + ... + 186956426288.

It is an arithmetic number, because the mean of its divisors is an integer number (158726004478608).

Almost surely, 2^{634530105063551} is an apocalyptic number.

634530105063551 is a deficient number, since it is larger than the sum of its proper divisors (373912850881).

634530105063551 is a wasteful number, since it uses less digits than its factorization.

634530105063551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373912850880.

The product of its (nonzero) digits is 2430000, while the sum is 47.

Adding to 634530105063551 its reverse (155360501035436), we get a palindrome (789890606098987).

The spelling of 634530105063551 in words is "six hundred thirty-four trillion, five hundred thirty billion, one hundred five million, sixty-three thousand, five hundred fifty-one".