691610160556 has 24 divisors (see below), whose sum is σ = 1383425227520. Its totient is φ = 296360446032.

The previous prime is 691610160551. The next prime is 691610160581. The reversal of 691610160556 is 655061016196.

It is a super-3 number, since 3×691610160556³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (691610160551) 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, 1636776 + ... + 2015503.

Almost surely, 2^691610160556 is an apocalyptic number.

It is an amenable number.

691610160556 is an abundant number, since it is smaller than the sum of its proper divisors (691815066964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691610160556 is a wasteful number, since it uses less digits than its factorization.

691610160556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659053 (or 3659051 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 691610160556 in words is "six hundred ninety-one billion, six hundred ten million, one hundred sixty thousand, five hundred fifty-six".