981815440465 has 32 divisors (see below), whose sum is σ = 1221224215680. Its totient is φ = 757170892800.

The previous prime is 981815440453. The next prime is 981815440469. The reversal of 981815440465 is 564044518189.

It is a de Polignac number, because none of the positive numbers 2^k-981815440465 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981815440469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12587185 + ... + 12664945.

It is an arithmetic number, because the mean of its divisors is an integer number (38163256740).

Almost surely, 2^981815440465 is an apocalyptic number.

It is an amenable number.

981815440465 is a deficient number, since it is larger than the sum of its proper divisors (239408775215).

981815440465 is a wasteful number, since it uses less digits than its factorization.

981815440465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78433.

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 981815440465 in words is "nine hundred eighty-one billion, eight hundred fifteen million, four hundred forty thousand, four hundred sixty-five".