3958217455987 has 4 divisors (see below), whose sum is σ = 4094707713120. Its totient is φ = 3821727198856.

The previous prime is 3958217455961. The next prime is 3958217455999. The reversal of 3958217455987 is 7895547128593.

3958217455987 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.

It is a cyclic number.

It is not a de Polignac number, because 3958217455987 - 2²⁷ = 3958083238259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3958217455187) 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, 68245128523 + ... + 68245128580.

It is an arithmetic number, because the mean of its divisors is an integer number (1023676928280).

Almost surely, 2^{3958217455987} is an apocalyptic number.

3958217455987 is a deficient number, since it is larger than the sum of its proper divisors (136490257133).

3958217455987 is a wasteful number, since it uses less digits than its factorization.

3958217455987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136490257132.

The product of its digits is 762048000, while the sum is 73.

The spelling of 3958217455987 in words is "three trillion, nine hundred fifty-eight billion, two hundred seventeen million, four hundred fifty-five thousand, nine hundred eighty-seven".