3987016557 has 4 divisors (see below), whose sum is σ = 5316022080. Its totient is φ = 2658011036.

The previous prime is 3987016549. The next prime is 3987016577. The reversal of 3987016557 is 7556107893.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7556107893 = 3 ⋅2518702631.

It is a cyclic number.

It is not a de Polignac number, because 3987016557 - 2³ = 3987016549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987016507) 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, 664502757 + ... + 664502762.

It is an arithmetic number, because the mean of its divisors is an integer number (1329005520).

Almost surely, 2^3987016557 is an apocalyptic number.

It is an amenable number.

3987016557 is a deficient number, since it is larger than the sum of its proper divisors (1329005523).

3987016557 is a wasteful number, since it uses less digits than its factorization.

3987016557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329005522.

The product of its (nonzero) digits is 1587600, while the sum is 51.

The square root of 3987016557 is about 63142.8266472131. The cubic root of 3987016557 is about 1585.6816961046.

The spelling of 3987016557 in words is "three billion, nine hundred eighty-seven million, sixteen thousand, five hundred fifty-seven".