85557776661 has 16 divisors (see below), whose sum is σ = 144859728000. Its totient is φ = 48890157984.

The previous prime is 85557776653. The next prime is 85557776699. The reversal of 85557776661 is 16667775558.

It is not a de Polignac number, because 85557776661 - 2³ = 85557776653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85557776651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226343136 + ... + 226343513.

It is an arithmetic number, because the mean of its divisors is an integer number (9053733000).

Almost surely, 2^85557776661 is an apocalyptic number.

It is an amenable number.

85557776661 is a deficient number, since it is larger than the sum of its proper divisors (59301951339).

85557776661 is a wasteful number, since it uses less digits than its factorization.

85557776661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452686665 (or 452686659 counting only the distinct ones).

The product of its digits is 74088000, while the sum is 63.

The spelling of 85557776661 in words is "eighty-five billion, five hundred fifty-seven million, seven hundred seventy-six thousand, six hundred sixty-one".