1015663887 has 16 divisors (see below), whose sum is σ = 1719642880. Its totient is φ = 580379256.

The previous prime is 1015663871. The next prime is 1015663907. The reversal of 1015663887 is 7883665101.

1015663887 is a `hidden beast` number, since 1 + 0 + 1 + 5 + 6 + 638 + 8 + 7 = 666.

It is not a de Polignac number, because 1015663887 - 2⁴ = 1015663871 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 (1015663387) 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, 2686753 + ... + 2687130.

It is an arithmetic number, because the mean of its divisors is an integer number (107477680).

Almost surely, 2^1015663887 is an apocalyptic number.

1015663887 is a deficient number, since it is larger than the sum of its proper divisors (703978993).

1015663887 is an equidigital number, since it uses as much as digits as its factorization.

1015663887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373899 (or 5373893 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1015663887 is about 31869.4820635667. The cubic root of 1015663887 is about 1005.1942685266.

The spelling of 1015663887 in words is "one billion, fifteen million, six hundred sixty-three thousand, eight hundred eighty-seven".