85191666949 has 16 divisors (see below), whose sum is σ = 87625324800. Its totient is φ = 82800267264.

The previous prime is 85191666919. The next prime is 85191666961. The reversal of 85191666949 is 94966619158.

It is a cyclic number.

It is not a de Polignac number, because 85191666949 - 2¹⁵ = 85191634181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85191666919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569349 + ... + 1622725.

It is an arithmetic number, because the mean of its divisors is an integer number (5476582800).

Almost surely, 2^85191666949 is an apocalyptic number.

85191666949 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

85191666949 is a deficient number, since it is larger than the sum of its proper divisors (2433657851).

85191666949 is a wasteful number, since it uses less digits than its factorization.

85191666949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53772.

The product of its digits is 25194240, while the sum is 64.

The spelling of 85191666949 in words is "eighty-five billion, one hundred ninety-one million, six hundred sixty-six thousand, nine hundred forty-nine".