261646730617377 has 48 divisors (see below), whose sum is σ = 408426579944640. Its totient is φ = 148551988620672.

The previous prime is 261646730617351. The next prime is 261646730617427. The reversal of 261646730617377 is 773716037646162.

It is not a de Polignac number, because 261646730617377 - 2⁶ = 261646730617313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261646730627377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 435177238 + ... + 435778064.

It is an arithmetic number, because the mean of its divisors is an integer number (8508887082180).

Almost surely, 2^{261646730617377} is an apocalyptic number.

It is an amenable number.

261646730617377 is a deficient number, since it is larger than the sum of its proper divisors (146779849327263).

261646730617377 is a wasteful number, since it uses less digits than its factorization.

261646730617377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619870 (or 619863 counting only the distinct ones).

The product of its (nonzero) digits is 224042112, while the sum is 66.

The spelling of 261646730617377 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred thirty million, six hundred seventeen thousand, three hundred seventy-seven".