81553017962 has 16 divisors (see below), whose sum is σ = 131938821672. Its totient is φ = 37582902720.

The previous prime is 81553017961. The next prime is 81553017971. The reversal of 81553017962 is 26971035518.

It can be written as a sum of positive squares in 4 ways, for example, as 48163130521 + 33389887441 = 219461^2 + 182729^2 .

It is not an unprimeable number, because it can be changed into a prime (81553017961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2355473 + ... + 2389844.

Almost surely, 2^81553017962 is an apocalyptic number.

81553017962 is a deficient number, since it is larger than the sum of its proper divisors (50385803710).

81553017962 is a wasteful number, since it uses less digits than its factorization.

81553017962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745993.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 81553017962 in words is "eighty-one billion, five hundred fifty-three million, seventeen thousand, nine hundred sixty-two".