635577356671 has 4 divisors (see below), whose sum is σ = 636797275344. Its totient is φ = 634357438000.

The previous prime is 635577356639. The next prime is 635577356677. The reversal of 635577356671 is 176653775536.

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

It is a cyclic number.

It is not a de Polignac number, because 635577356671 - 2⁵ = 635577356639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635577356677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609958555 + ... + 609959596.

It is an arithmetic number, because the mean of its divisors is an integer number (159199318836).

Almost surely, 2^635577356671 is an apocalyptic number.

635577356671 is a deficient number, since it is larger than the sum of its proper divisors (1219918673).

635577356671 is a wasteful number, since it uses less digits than its factorization.

635577356671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219918672.

The product of its digits is 83349000, while the sum is 61.

The spelling of 635577356671 in words is "six hundred thirty-five billion, five hundred seventy-seven million, three hundred fifty-six thousand, six hundred seventy-one".