61489616841 has 9 divisors (see below), whose sum is σ = 88819409991. Its totient is φ = 40992581952.

The previous prime is 61489616833. The next prime is 61489616941. The reversal of 61489616841 is 14861698416.

The square root of 61489616841 is 247971.

It is a perfect power (a square), and thus also a powerful number.

61489616841 is a `hidden beast` number, since 6 + 1 + 489 + 61 + 68 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 37123655625 + 24365961216 = 192675^2 + 156096^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 61489616841 - 2³ = 61489616833 is a prime.

It is a super-3 number, since 3×61489616841³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61489616141) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 702585 + ... + 785241.

Almost surely, 2^61489616841 is an apocalyptic number.

61489616841 is the 247971-st square number.

61489616841 is the 123986-th centered octagonal number.

It is an amenable number.

61489616841 is a deficient number, since it is larger than the sum of its proper divisors (27329793150).

61489616841 is an frugal number, since it uses more digits than its factorization.

61489616841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165320 (or 82660 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 61489616841 in words is "sixty-one billion, four hundred eighty-nine million, six hundred sixteen thousand, eight hundred forty-one".