635159394961 has 8 divisors (see below), whose sum is σ = 781734640064. Its totient is φ = 502543697040.

The previous prime is 635159394949. The next prime is 635159394997. The reversal of 635159394961 is 169493951536.

635159394961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 635159394961 - 2¹⁵ = 635159362193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 635159394961.

It is not an unprimeable number, because it can be changed into a prime (635159394061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3489886695 + ... + 3489886876.

It is an arithmetic number, because the mean of its divisors is an integer number (97716830008).

Almost surely, 2^635159394961 is an apocalyptic number.

It is an amenable number.

635159394961 is a deficient number, since it is larger than the sum of its proper divisors (146575245103).

635159394961 is a wasteful number, since it uses less digits than its factorization.

635159394961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979773591.

The product of its digits is 23619600, while the sum is 61.

It can be divided in two parts, 63515939 and 4961, that added together give a square (63520900 = 7970²).

The spelling of 635159394961 in words is "six hundred thirty-five billion, one hundred fifty-nine million, three hundred ninety-four thousand, nine hundred sixty-one".