10538278381 has 4 divisors (see below), whose sum is σ = 10636767072. Its totient is φ = 10439789692.

The previous prime is 10538278367. The next prime is 10538278409. The reversal of 10538278381 is 18387283501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18387283501 = 25163 ⋅730727.

It is a cyclic number.

It is not a de Polignac number, because 10538278381 - 2³¹ = 8390794733 is a prime.

It is a super-2 number, since 2×10538278381² (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 (10538278081) 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, 49244185 + ... + 49244398.

It is an arithmetic number, because the mean of its divisors is an integer number (2659191768).

Almost surely, 2^10538278381 is an apocalyptic number.

It is an amenable number.

10538278381 is a deficient number, since it is larger than the sum of its proper divisors (98488691).

10538278381 is an equidigital number, since it uses as much as digits as its factorization.

10538278381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98488690.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 10538278381 in words is "ten billion, five hundred thirty-eight million, two hundred seventy-eight thousand, three hundred eighty-one".