81543470700144 has 40 divisors (see below), whose sum is σ = 210654290294272. Its totient is φ = 27181115052480.

The previous prime is 81543470700127. The next prime is 81543470700151. The reversal of 81543470700144 is 44100707434518.

It is a happy number.

It is a super-2 number, since 2×81543470700144² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 81543470700093 and 81543470700102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56949639 + ... + 58363929.

Almost surely, 2^{81543470700144} is an apocalyptic number.

It is an amenable number.

81543470700144 is an abundant number, since it is smaller than the sum of its proper divisors (129110819594128).

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

81543470700144 is a wasteful number, since it uses less digits than its factorization.

81543470700144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615485 (or 2615479 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 48.

The spelling of 81543470700144 in words is "eighty-one trillion, five hundred forty-three billion, four hundred seventy million, seven hundred thousand, one hundred forty-four".