634642155964 has 6 divisors (see below), whose sum is σ = 1110623772944. Its totient is φ = 317321077980.

The previous prime is 634642155947. The next prime is 634642155971. The reversal of 634642155964 is 469551246436.

It is a happy number.

It is a super-3 number, since 3×634642155964³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79330269492 + ... + 79330269499.

Almost surely, 2^634642155964 is an apocalyptic number.

It is an amenable number.

634642155964 is a deficient number, since it is larger than the sum of its proper divisors (475981616980).

634642155964 is a wasteful number, since it uses less digits than its factorization.

634642155964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158660538995 (or 158660538993 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 55.

The spelling of 634642155964 in words is "six hundred thirty-four billion, six hundred forty-two million, one hundred fifty-five thousand, nine hundred sixty-four".