1061221156163 has 16 divisors (see below), whose sum is σ = 1245355138560. Its totient is φ = 885519279936.

The previous prime is 1061221156157. The next prime is 1061221156183. The reversal of 1061221156163 is 3616511221601.

It is a cyclic number.

It is not a de Polignac number, because 1061221156163 - 2²² = 1061216961859 is a prime.

It is a super-2 number, since 2×1061221156163² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061221156123) 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, 12430970 + ... + 12516047.

It is an arithmetic number, because the mean of its divisors is an integer number (77834696160).

Almost surely, 2^{1061221156163} is an apocalyptic number.

1061221156163 is a deficient number, since it is larger than the sum of its proper divisors (184133982397).

1061221156163 is a wasteful number, since it uses less digits than its factorization.

1061221156163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24947186.

The product of its (nonzero) digits is 12960, while the sum is 35.

Adding to 1061221156163 its reverse (3616511221601), we get a palindrome (4677732377764).

The spelling of 1061221156163 in words is "one trillion, sixty-one billion, two hundred twenty-one million, one hundred fifty-six thousand, one hundred sixty-three".