938666457620 has 18 divisors (see below), whose sum is σ = 1971208659966. Its totient is φ = 375464849920.

The previous prime is 938666457613. The next prime is 938666457623. The reversal of 938666457620 is 26754666839.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 483853795216 + 454812662404 = 695596^2 + 674398^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (938666457623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4224500 + ... + 4441140.

Almost surely, 2^938666457620 is an apocalyptic number.

It is an amenable number.

938666457620 is an abundant number, since it is smaller than the sum of its proper divisors (1032542202346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

938666457620 is an frugal number, since it uses more digits than its factorization.

938666457620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433291 (or 216648 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 938666457620 in words is "nine hundred thirty-eight billion, six hundred sixty-six million, four hundred fifty-seven thousand, six hundred twenty".