387957056557 has 4 divisors (see below), whose sum is σ = 443379493216. Its totient is φ = 332534619900.

The previous prime is 387957056551. The next prime is 387957056563. The reversal of 387957056557 is 755650759783.

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 an interprime number because it is at equal distance from previous prime (387957056551) and next prime (387957056563).

It is not a de Polignac number, because 387957056557 - 2³¹ = 385809572909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 387957056492 and 387957056501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387957056551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27711218319 + ... + 27711218332.

It is an arithmetic number, because the mean of its divisors is an integer number (110844873304).

Almost surely, 2^387957056557 is an apocalyptic number.

It is an amenable number.

387957056557 is a deficient number, since it is larger than the sum of its proper divisors (55422436659).

387957056557 is an equidigital number, since it uses as much as digits as its factorization.

387957056557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55422436658.

The product of its (nonzero) digits is 277830000, while the sum is 67.

The spelling of 387957056557 in words is "three hundred eighty-seven billion, nine hundred fifty-seven million, fifty-six thousand, five hundred fifty-seven".