671238385554 has 128 divisors (see below), whose sum is σ = 1529360455680. Its totient is φ = 196157881920.

The previous prime is 671238385451. The next prime is 671238385579. The reversal of 671238385554 is 455583832176.

It is a super-2 number, since 2×671238385554² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671238385494 and 671238385503.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 335115517 + ... + 335117519.

It is an arithmetic number, because the mean of its divisors is an integer number (11948128560).

Almost surely, 2^671238385554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671238385554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764680227840).

671238385554 is an abundant number, since it is smaller than the sum of its proper divisors (858122070126).

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

671238385554 is a wasteful number, since it uses less digits than its factorization.

671238385554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517 (or 3495 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 57.

The spelling of 671238385554 in words is "six hundred seventy-one billion, two hundred thirty-eight million, three hundred eighty-five thousand, five hundred fifty-four".