3918665893957 has 4 divisors (see below), whose sum is σ = 3918741614656. Its totient is φ = 3918590173260.

The previous prime is 3918665893937. The next prime is 3918665893963. The reversal of 3918665893957 is 7593985668193.

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 3918665893957 - 2¹¹ = 3918665891909 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 (3918665893907) 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, 37782669 + ... + 37886242.

It is an arithmetic number, because the mean of its divisors is an integer number (979685403664).

Almost surely, 2^{3918665893957} is an apocalyptic number.

It is an amenable number.

3918665893957 is a deficient number, since it is larger than the sum of its proper divisors (75720699).

3918665893957 is an equidigital number, since it uses as much as digits as its factorization.

3918665893957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75720698.

The product of its digits is 2645395200, while the sum is 79.

The spelling of 3918665893957 in words is "three trillion, nine hundred eighteen billion, six hundred sixty-five million, eight hundred ninety-three thousand, nine hundred fifty-seven".