3865424977981 has 4 divisors (see below), whose sum is σ = 4417628546272. Its totient is φ = 3313221409692.

The previous prime is 3865424977969. The next prime is 3865424978057. The reversal of 3865424977981 is 1897794245683.

3865424977981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3865424977981 - 2¹³ = 3865424969789 is a prime.

It is a super-2 number, since 2×3865424977981² (a number of 26 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 (3865424977901) 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, 276101784135 + ... + 276101784148.

It is an arithmetic number, because the mean of its divisors is an integer number (1104407136568).

Almost surely, 2^{3865424977981} is an apocalyptic number.

It is an amenable number.

3865424977981 is a deficient number, since it is larger than the sum of its proper divisors (552203568291).

3865424977981 is an equidigital number, since it uses as much as digits as its factorization.

3865424977981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552203568290.

The product of its digits is 731566080, while the sum is 73.

The spelling of 3865424977981 in words is "three trillion, eight hundred sixty-five billion, four hundred twenty-four million, nine hundred seventy-seven thousand, nine hundred eighty-one".