81352214925 has 48 divisors (see below), whose sum is σ = 138139634688. Its totient is φ = 42221995200.

The previous prime is 81352214897. The next prime is 81352214947. The reversal of 81352214925 is 52941225318.

It is not a de Polignac number, because 81352214925 - 2²¹ = 81350117773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 827434 + ... + 920516.

It is an arithmetic number, because the mean of its divisors is an integer number (2877909056).

Almost surely, 2^81352214925 is an apocalyptic number.

It is an amenable number.

81352214925 is a deficient number, since it is larger than the sum of its proper divisors (56787419763).

81352214925 is a wasteful number, since it uses less digits than its factorization.

81352214925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93410 (or 93405 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The spelling of 81352214925 in words is "eighty-one billion, three hundred fifty-two million, two hundred fourteen thousand, nine hundred twenty-five".