61766771904 has 42 divisors (see below), whose sum is σ = 177043300980. Its totient is φ = 20588923776.

The previous prime is 61766771879. The next prime is 61766771909. The reversal of 61766771904 is 40917766716.

61766771904 is a `hidden beast` number, since 617 + 6 + 6 + 7 + 7 + 19 + 0 + 4 = 666.

It is a super-3 number, since 3×61766771904³ (a number of 33 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 (61766771909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53616414 + ... + 53617565.

It is an arithmetic number, because the mean of its divisors is an integer number (4215316690).

Almost surely, 2^61766771904 is an apocalyptic number.

61766771904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61766771904 is an abundant number, since it is smaller than the sum of its proper divisors (115276529076).

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

61766771904 is a wasteful number, since it uses less digits than its factorization.

61766771904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107233997 (or 107233984 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The spelling of 61766771904 in words is "sixty-one billion, seven hundred sixty-six million, seven hundred seventy-one thousand, nine hundred four".