81777350104 has 32 divisors (see below), whose sum is σ = 153554227200. Its totient is φ = 40829610400.

The previous prime is 81777350101. The next prime is 81777350107. The reversal of 81777350104 is 40105377718.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81777350101) and next prime (81777350107).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81777350101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28403337 + ... + 28406215.

It is an arithmetic number, because the mean of its divisors is an integer number (4798569600).

Almost surely, 2^81777350104 is an apocalyptic number.

It is an amenable number.

81777350104 is a deficient number, since it is larger than the sum of its proper divisors (71776877096).

81777350104 is a wasteful number, since it uses less digits than its factorization.

81777350104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783 (or 6779 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 81777350104 in words is "eighty-one billion, seven hundred seventy-seven million, three hundred fifty thousand, one hundred four".