1985894661077 has 8 divisors (see below), whose sum is σ = 2011143530880. Its totient is φ = 1960755331600.

The previous prime is 1985894661073. The next prime is 1985894661133. The reversal of 1985894661077 is 7701664985891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1985894661077 - 2² = 1985894661073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1985894661077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985894661073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27348593 + ... + 27421110.

It is an arithmetic number, because the mean of its divisors is an integer number (251392941360).

Almost surely, 2^{1985894661077} is an apocalyptic number.

It is an amenable number.

1985894661077 is a deficient number, since it is larger than the sum of its proper divisors (25248869803).

1985894661077 is a wasteful number, since it uses less digits than its factorization.

1985894661077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54770163.

The product of its (nonzero) digits is 182891520, while the sum is 71.

The spelling of 1985894661077 in words is "one trillion, nine hundred eighty-five billion, eight hundred ninety-four million, six hundred sixty-one thousand, seventy-seven".