81630977355 has 24 divisors (see below), whose sum is σ = 141503769888. Its totient is φ = 43533421056.

The previous prime is 81630977297. The next prime is 81630977359. The reversal of 81630977355 is 55377903618.

It is not a de Polignac number, because 81630977355 - 2¹³ = 81630969163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81630977359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 664914 + ... + 778056.

It is an arithmetic number, because the mean of its divisors is an integer number (5895990412).

Almost surely, 2^81630977355 is an apocalyptic number.

81630977355 is a deficient number, since it is larger than the sum of its proper divisors (59872792533).

81630977355 is a wasteful number, since it uses less digits than its factorization.

81630977355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129187 (or 129184 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 81630977355 in words is "eighty-one billion, six hundred thirty million, nine hundred seventy-seven thousand, three hundred fifty-five".