855255097840 has 80 divisors (see below), whose sum is σ = 2336102417376. Its totient is φ = 287078630400.

The previous prime is 855255097831. The next prime is 855255097859. The reversal of 855255097840 is 48790552558.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×855255097840² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37368591 + ... + 37391470.

Almost surely, 2^855255097840 is an apocalyptic number.

855255097840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

855255097840 is an abundant number, since it is smaller than the sum of its proper divisors (1480847319536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855255097840 is a wasteful number, since it uses less digits than its factorization.

855255097840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74760098 (or 74760092 counting only the distinct ones).

The product of its (nonzero) digits is 20160000, while the sum is 58.

The spelling of 855255097840 in words is "eight hundred fifty-five billion, two hundred fifty-five million, ninety-seven thousand, eight hundred forty".