22078451381 has 4 divisors (see below), whose sum is σ = 25232515872. Its totient is φ = 18924386892.

The previous prime is 22078451377. The next prime is 22078451389. The reversal of 22078451381 is 18315487022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22078451381 - 2² = 22078451377 is a prime.

It is a super-2 number, since 2×22078451381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22078451389) 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, 1577032235 + ... + 1577032248.

It is an arithmetic number, because the mean of its divisors is an integer number (6308128968).

Almost surely, 2^22078451381 is an apocalyptic number.

It is an amenable number.

22078451381 is a deficient number, since it is larger than the sum of its proper divisors (3154064491).

22078451381 is an equidigital number, since it uses as much as digits as its factorization.

22078451381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154064490.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 22078451381 in words is "twenty-two billion, seventy-eight million, four hundred fifty-one thousand, three hundred eighty-one".