387661578237321 has 40 divisors (see below), whose sum is σ = 547610981215104. Its totient is φ = 243935360304480.

The previous prime is 387661578237319. The next prime is 387661578237379. The reversal of 387661578237321 is 123732875166783.

It is a happy number.

It is not a de Polignac number, because 387661578237321 - 2¹ = 387661578237319 is a prime.

It is a super-2 number, since 2×387661578237321² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (387661578232321) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 104121535 + ... + 107780411.

Almost surely, 2^{387661578237321} is an apocalyptic number.

It is an amenable number.

387661578237321 is a deficient number, since it is larger than the sum of its proper divisors (159949402977783).

387661578237321 is an frugal number, since it uses more digits than its factorization.

387661578237321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659227 (or 3659170 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 69.

The spelling of 387661578237321 in words is "three hundred eighty-seven trillion, six hundred sixty-one billion, five hundred seventy-eight million, two hundred thirty-seven thousand, three hundred twenty-one".