3981507505999 has 4 divisors (see below), whose sum is σ = 3991436452800. Its totient is φ = 3971578559200.

The previous prime is 3981507505991. The next prime is 3981507506021. The reversal of 3981507505999 is 9995057051893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3981507505999 - 2³ = 3981507505991 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 (3981507505991) 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, 4964472799 + ... + 4964473600.

It is an arithmetic number, because the mean of its divisors is an integer number (997859113200).

Almost surely, 2^{3981507505999} is an apocalyptic number.

3981507505999 is a deficient number, since it is larger than the sum of its proper divisors (9928946801).

3981507505999 is an equidigital number, since it uses as much as digits as its factorization.

3981507505999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9928946800.

The product of its (nonzero) digits is 137781000, while the sum is 70.

The spelling of 3981507505999 in words is "three trillion, nine hundred eighty-one billion, five hundred seven million, five hundred five thousand, nine hundred ninety-nine".