634920793651 has 16 divisors (see below), whose sum is σ = 643935412224. Its totient is φ = 625966046784.

The previous prime is 634920793649. The next prime is 634920793673. The reversal of 634920793651 is 156397029436.

It is a cyclic number.

It is not a de Polignac number, because 634920793651 - 2¹ = 634920793649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634920793592 and 634920793601.

It is not an unprimeable number, because it can be changed into a prime (634920793621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59405230 + ... + 59415916.

It is an arithmetic number, because the mean of its divisors is an integer number (40245963264).

Almost surely, 2^634920793651 is an apocalyptic number.

634920793651 is a deficient number, since it is larger than the sum of its proper divisors (9014618573).

634920793651 is a wasteful number, since it uses less digits than its factorization.

634920793651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13410.

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 634920793651 in words is "six hundred thirty-four billion, nine hundred twenty million, seven hundred ninety-three thousand, six hundred fifty-one".