840898660811 has 4 divisors (see below), whose sum is σ = 917343993624. Its totient is φ = 764453328000.

The previous prime is 840898660759. The next prime is 840898660867. The reversal of 840898660811 is 118066898048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840898660811 - 2¹⁰ = 840898659787 is a prime.

It is a super-2 number, since 2×840898660811² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840898660871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38222666390 + ... + 38222666411.

It is an arithmetic number, because the mean of its divisors is an integer number (229335998406).

Almost surely, 2^840898660811 is an apocalyptic number.

840898660811 is a deficient number, since it is larger than the sum of its proper divisors (76445332813).

840898660811 is a wasteful number, since it uses less digits than its factorization.

840898660811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76445332812.

The product of its (nonzero) digits is 5308416, while the sum is 59.

The spelling of 840898660811 in words is "eight hundred forty billion, eight hundred ninety-eight million, six hundred sixty thousand, eight hundred eleven".