1016512651261 has 2 divisors, whose sum is σ = 1016512651262. Its totient is φ = 1016512651260.

The previous prime is 1016512651243. The next prime is 1016512651307. The reversal of 1016512651261 is 1621562156101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016428928761 + 83722500 = 1008181^2 + 9150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1016512651261 - 2¹¹ = 1016512649213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1016512651261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1016512651241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 508256325630 + 508256325631.

It is an arithmetic number, because the mean of its divisors is an integer number (508256325631).

Almost surely, 2^{1016512651261} is an apocalyptic number.

It is an amenable number.

1016512651261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1016512651261 is an equidigital number, since it uses as much as digits as its factorization.

1016512651261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 1016512651261 in words is "one trillion, sixteen billion, five hundred twelve million, six hundred fifty-one thousand, two hundred sixty-one".