961765650541 has 4 divisors (see below), whose sum is σ = 962382564000. Its totient is φ = 961148737084.

The previous prime is 961765650529. The next prime is 961765650551. The reversal of 961765650541 is 145056567169.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145056567169 = 380623 ⋅381103.

It is a cyclic number.

It is not a de Polignac number, because 961765650541 - 2¹⁷ = 961765519469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961765650551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308454391 + ... + 308457508.

It is an arithmetic number, because the mean of its divisors is an integer number (240595641000).

Almost surely, 2^961765650541 is an apocalyptic number.

It is an amenable number.

961765650541 is a deficient number, since it is larger than the sum of its proper divisors (616913459).

961765650541 is a wasteful number, since it uses less digits than its factorization.

961765650541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616913458.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 961765650541 in words is "nine hundred sixty-one billion, seven hundred sixty-five million, six hundred fifty thousand, five hundred forty-one".