661626065135 has 16 divisors (see below), whose sum is σ = 907391025216. Its totient is φ = 453677376768.

The previous prime is 661626065081. The next prime is 661626065161. The reversal of 661626065135 is 531560626166.

It is not a de Polignac number, because 661626065135 - 2¹⁸ = 661625802991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661626065135.

It is a congruent number.

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, 1918259 + ... + 2236731.

It is an arithmetic number, because the mean of its divisors is an integer number (56711939076).

Almost surely, 2^661626065135 is an apocalyptic number.

661626065135 is a deficient number, since it is larger than the sum of its proper divisors (245764960081).

661626065135 is a wasteful number, since it uses less digits than its factorization.

661626065135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377842.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 661626065135 in words is "six hundred sixty-one billion, six hundred twenty-six million, sixty-five thousand, one hundred thirty-five".