1011556550651 has 2 divisors, whose sum is σ = 1011556550652. Its totient is φ = 1011556550650.

The previous prime is 1011556550633. The next prime is 1011556550659. The reversal of 1011556550651 is 1560556551101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011556550651 is a prime.

It is a super-3 number, since 3×1011556550651³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1011556550599 and 1011556550608.

It is not a weakly prime, because it can be changed into another prime (1011556550659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505778275325 + 505778275326.

It is an arithmetic number, because the mean of its divisors is an integer number (505778275326).

Almost surely, 2^{1011556550651} is an apocalyptic number.

1011556550651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011556550651 is an equidigital number, since it uses as much as digits as its factorization.

1011556550651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 1011556550651 in words is "one trillion, eleven billion, five hundred fifty-six million, five hundred fifty thousand, six hundred fifty-one".