961507330581 has 32 divisors (see below), whose sum is σ = 1543699722240. Its totient is φ = 520441979904.

The previous prime is 961507330549. The next prime is 961507330583. The reversal of 961507330581 is 185033705169.

It is not a de Polignac number, because 961507330581 - 2⁵ = 961507330549 is a prime.

It is a super-2 number, since 2×961507330581² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 961507330581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961507330583) 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 31 ways as a sum of consecutive naturals, for example, 9613836 + ... + 9713333.

It is an arithmetic number, because the mean of its divisors is an integer number (48240616320).

Almost surely, 2^961507330581 is an apocalyptic number.

It is an amenable number.

961507330581 is a deficient number, since it is larger than the sum of its proper divisors (582192391659).

961507330581 is a wasteful number, since it uses less digits than its factorization.

961507330581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19327305.

The product of its (nonzero) digits is 680400, while the sum is 48.

The spelling of 961507330581 in words is "nine hundred sixty-one billion, five hundred seven million, three hundred thirty thousand, five hundred eighty-one".