3991539742018 has 16 divisors (see below), whose sum is σ = 6085536304320. Its totient is φ = 1963028437200.

The previous prime is 3991539741991. The next prime is 3991539742067. The reversal of 3991539742018 is 8102479351993.

3991539742018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13993603 + ... + 14275993.

It is an arithmetic number, because the mean of its divisors is an integer number (380346019020).

Almost surely, 2^{3991539742018} is an apocalyptic number.

3991539742018 is a deficient number, since it is larger than the sum of its proper divisors (2093996562302).

3991539742018 is a wasteful number, since it uses less digits than its factorization.

3991539742018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398313.

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 3991539742018 in words is "three trillion, nine hundred ninety-one billion, five hundred thirty-nine million, seven hundred forty-two thousand, eighteen".