855739401981 has 8 divisors (see below), whose sum is σ = 1141336200384. Its totient is φ = 570317769120.

The previous prime is 855739401941. The next prime is 855739401997. The reversal of 855739401981 is 189104937558.

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

It is not a de Polignac number, because 855739401981 - 2⁶ = 855739401917 is a prime.

It is a super-2 number, since 2×855739401981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855739401901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43779985 + ... + 43799526.

It is an arithmetic number, because the mean of its divisors is an integer number (142667025048).

Almost surely, 2^855739401981 is an apocalyptic number.

It is an amenable number.

855739401981 is a deficient number, since it is larger than the sum of its proper divisors (285596798403).

855739401981 is a wasteful number, since it uses less digits than its factorization.

855739401981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87582771.

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 855739401981 in words is "eight hundred fifty-five billion, seven hundred thirty-nine million, four hundred one thousand, nine hundred eighty-one".