387722818261 has 16 divisors (see below), whose sum is σ = 418882647040. Its totient is φ = 357689954160.

The previous prime is 387722818177. The next prime is 387722818271. The reversal of 387722818261 is 162818227783.

It is a cyclic number.

It is not a de Polignac number, because 387722818261 - 2²⁷ = 387588600533 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 (387722818271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446445 + ... + 987298.

It is an arithmetic number, because the mean of its divisors is an integer number (26180165440).

Almost surely, 2^387722818261 is an apocalyptic number.

It is an amenable number.

387722818261 is a deficient number, since it is larger than the sum of its proper divisors (31159828779).

387722818261 is a wasteful number, since it uses less digits than its factorization.

387722818261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434136.

The product of its digits is 3612672, while the sum is 55.

The spelling of 387722818261 in words is "three hundred eighty-seven billion, seven hundred twenty-two million, eight hundred eighteen thousand, two hundred sixty-one".