1011016557 has 12 divisors (see below), whose sum is σ = 1460666844. Its totient is φ = 673868160.

The previous prime is 1011016553. The next prime is 1011016621. The reversal of 1011016557 is 7556101101.

It is a happy number.

1011016557 is a `hidden beast` number, since 1 + 0 + 1 + 1 + 0 + 1 + 655 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 506520036 + 504496521 = 22506^2 + 22461^2 .

It is not a de Polignac number, because 1011016557 - 2² = 1011016553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011016557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011016553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49663 + ... + 66995.

It is an arithmetic number, because the mean of its divisors is an integer number (121722237).

Almost surely, 2^1011016557 is an apocalyptic number.

It is an amenable number.

1011016557 is a deficient number, since it is larger than the sum of its proper divisors (449650287).

1011016557 is a wasteful number, since it uses less digits than its factorization.

1011016557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23820 (or 23817 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 27.

The square root of 1011016557 is about 31796.4865511899. The cubic root of 1011016557 is about 1003.6587826499.

Adding to 1011016557 its reverse (7556101101), we get a palindrome (8567117658).

The spelling of 1011016557 in words is "one billion, eleven million, sixteen thousand, five hundred fifty-seven".