264815105661 has 6 divisors (see below), whose sum is σ = 382510708190. Its totient is φ = 176543403768.

The previous prime is 264815105657. The next prime is 264815105663. The reversal of 264815105661 is 166501518462.

264815105661 is a `hidden beast` number, since 2 + 6 + 4 + 81 + 5 + 1 + 0 + 566 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 217146680100 + 47668425561 = 465990^2 + 218331^2 .

It is not a de Polignac number, because 264815105661 - 2² = 264815105657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264815105663) 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 5 ways as a sum of consecutive naturals, for example, 14711950306 + ... + 14711950323.

Almost surely, 2^264815105661 is an apocalyptic number.

It is an amenable number.

264815105661 is a deficient number, since it is larger than the sum of its proper divisors (117695602529).

264815105661 is a wasteful number, since it uses less digits than its factorization.

264815105661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29423900635 (or 29423900632 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 264815105661 in words is "two hundred sixty-four billion, eight hundred fifteen million, one hundred five thousand, six hundred sixty-one".