81877183810 has 32 divisors (see below), whose sum is σ = 156073452912. Its totient is φ = 30819379200.

The previous prime is 81877183807. The next prime is 81877183813. The reversal of 81877183810 is 1838177818.

It is an interprime number because it is at equal distance from previous prime (81877183807) and next prime (81877183813).

It can be written as a sum of positive squares in 8 ways, for example, as 52465276809 + 29411907001 = 229053^2 + 171499^2 .

It is a super-2 number, since 2×81877183810² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81877183813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1119360 + ... + 1190260.

Almost surely, 2^81877183810 is an apocalyptic number.

81877183810 is a deficient number, since it is larger than the sum of its proper divisors (74196269102).

81877183810 is a wasteful number, since it uses less digits than its factorization.

81877183810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77718.

The product of its (nonzero) digits is 602112, while the sum is 52.

The spelling of 81877183810 in words is "eighty-one billion, eight hundred seventy-seven million, one hundred eighty-three thousand, eight hundred ten".