1061654615665 has 16 divisors (see below), whose sum is σ = 1470993616512. Its totient is φ = 720486664704.

The previous prime is 1061654615627. The next prime is 1061654615677. The reversal of 1061654615665 is 5665164561601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1061654615665 is a prime.

It is a super-2 number, since 2×1061654615665² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156352219 + ... + 156359008.

It is an arithmetic number, because the mean of its divisors is an integer number (91937101032).

Almost surely, 2^{1061654615665} is an apocalyptic number.

It is an amenable number.

1061654615665 is a deficient number, since it is larger than the sum of its proper divisors (409339000847).

1061654615665 is an equidigital number, since it uses as much as digits as its factorization.

1061654615665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312711336.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 1061654615665 in words is "one trillion, sixty-one billion, six hundred fifty-four million, six hundred fifteen thousand, six hundred sixty-five".