81598819200 has 96 divisors (see below), whose sum is σ = 268766142360. Its totient is φ = 21759682560.

The previous prime is 81598819193. The next prime is 81598819207. The reversal of 81598819200 is 291889518.

It is an interprime number because it is at equal distance from previous prime (81598819193) and next prime (81598819207).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81598819207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4240339 + ... + 4259538.

Almost surely, 2^81598819200 is an apocalyptic number.

81598819200 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81598819200 is an abundant number, since it is smaller than the sum of its proper divisors (187167323160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81598819200 is a wasteful number, since it uses less digits than its factorization.

81598819200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8499904 (or 8499887 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 51.

The spelling of 81598819200 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred nineteen thousand, two hundred".