89461661778 has 12 divisors (see below), whose sum is σ = 193833600558. Its totient is φ = 29820553920.

The previous prime is 89461661771. The next prime is 89461661797. The reversal of 89461661778 is 87716616498.

89461661778 is a `hidden beast` number, since 8 + 9 + 4 + 6 + 1 + 6 + 617 + 7 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 70125924969 + 19335736809 = 264813^2 + 139053^2 .

It is a super-2 number, since 2×89461661778² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (89461661771) 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, 2485046143 + ... + 2485046178.

Almost surely, 2^89461661778 is an apocalyptic number.

89461661778 is an abundant number, since it is smaller than the sum of its proper divisors (104371938780).

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

89461661778 is a wasteful number, since it uses less digits than its factorization.

89461661778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970092329 (or 4970092326 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 89461661778 in words is "eighty-nine billion, four hundred sixty-one million, six hundred sixty-one thousand, seven hundred seventy-eight".