978055926381 has 6 divisors (see below), whose sum is σ = 1412747449230. Its totient is φ = 652037284248.

The previous prime is 978055926347. The next prime is 978055926413. The reversal of 978055926381 is 183629550879.

978055926381 is a `hidden beast` number, since 9 + 7 + 8 + 0 + 5 + 592 + 6 + 38 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 604209281481 + 373846644900 = 777309^2 + 611430^2 .

It is not a de Polignac number, because 978055926381 - 2⁶ = 978055926317 is a prime.

It is a super-2 number, since 2×978055926381² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978055926581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54336440346 + ... + 54336440363.

It is an arithmetic number, because the mean of its divisors is an integer number (235457908205).

Almost surely, 2^978055926381 is an apocalyptic number.

It is an amenable number.

978055926381 is a deficient number, since it is larger than the sum of its proper divisors (434691522849).

978055926381 is a wasteful number, since it uses less digits than its factorization.

978055926381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108672880715 (or 108672880712 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 63.

The spelling of 978055926381 in words is "nine hundred seventy-eight billion, fifty-five million, nine hundred twenty-six thousand, three hundred eighty-one".