3977218886509 has 8 divisors (see below), whose sum is σ = 4527427033152. Its totient is φ = 3458451205440.

The previous prime is 3977218886497. The next prime is 3977218886521. The reversal of 3977218886509 is 9056888127793.

It is an interprime number because it is at equal distance from previous prime (3977218886497) and next prime (3977218886521).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3977218886509 - 2⁵ = 3977218886477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3977218886579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7860116124 + ... + 7860116629.

It is an arithmetic number, because the mean of its divisors is an integer number (565928379144).

Almost surely, 2^{3977218886509} is an apocalyptic number.

It is an amenable number.

3977218886509 is a deficient number, since it is larger than the sum of its proper divisors (550208146643).

3977218886509 is a wasteful number, since it uses less digits than its factorization.

3977218886509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15720232787.

The product of its (nonzero) digits is 365783040, while the sum is 73.

The spelling of 3977218886509 in words is "three trillion, nine hundred seventy-seven billion, two hundred eighteen million, eight hundred eighty-six thousand, five hundred nine".