81377831803 has 2 divisors, whose sum is σ = 81377831804. Its totient is φ = 81377831802.

The previous prime is 81377831797. The next prime is 81377831893. The reversal of 81377831803 is 30813877318.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81377831803 - 2¹⁷ = 81377700731 is a prime.

It is not a weakly prime, because it can be changed into another prime (81377831893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40688915901 + 40688915902.

It is an arithmetic number, because the mean of its divisors is an integer number (40688915902).

Almost surely, 2^81377831803 is an apocalyptic number.

81377831803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81377831803 is an equidigital number, since it uses as much as digits as its factorization.

81377831803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 81377831803 in words is "eighty-one billion, three hundred seventy-seven million, eight hundred thirty-one thousand, eight hundred three".