891800754985 has 16 divisors (see below), whose sum is σ = 1223233854336. Its totient is φ = 611424108288.

The previous prime is 891800754983. The next prime is 891800755019. The reversal of 891800754985 is 589457008198.

It is not a de Polignac number, because 891800754985 - 2¹ = 891800754983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891800754983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1782999 + ... + 2227708.

It is an arithmetic number, because the mean of its divisors is an integer number (76452115896).

Almost surely, 2^891800754985 is an apocalyptic number.

It is an amenable number.

891800754985 is a deficient number, since it is larger than the sum of its proper divisors (331433099351).

891800754985 is a wasteful number, since it uses less digits than its factorization.

891800754985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017072.

The product of its (nonzero) digits is 29030400, while the sum is 64.

The spelling of 891800754985 in words is "eight hundred ninety-one billion, eight hundred million, seven hundred fifty-four thousand, nine hundred eighty-five".