1061515665655 has 4 divisors (see below), whose sum is σ = 1273818798792. Its totient is φ = 849212532520.

The previous prime is 1061515665653. The next prime is 1061515665671. The reversal of 1061515665655 is 5565665151601.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1061515665655 - 2¹ = 1061515665653 is a prime.

It is a super-2 number, since 2×1061515665655² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061515665653) 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 in 3 ways as a sum of consecutive naturals, for example, 106151566561 + ... + 106151566570.

It is an arithmetic number, because the mean of its divisors is an integer number (318454699698).

Almost surely, 2^{1061515665655} is an apocalyptic number.

1061515665655 is a deficient number, since it is larger than the sum of its proper divisors (212303133137).

1061515665655 is an equidigital number, since it uses as much as digits as its factorization.

1061515665655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212303133136.

The product of its (nonzero) digits is 4050000, while the sum is 52.

The spelling of 1061515665655 in words is "one trillion, sixty-one billion, five hundred fifteen million, six hundred sixty-five thousand, six hundred fifty-five".