81142507395 has 24 divisors (see below), whose sum is σ = 140673390000. Its totient is φ = 43267887936.

The previous prime is 81142507367. The next prime is 81142507429. The reversal of 81142507395 is 59370524118.

81142507395 is a `hidden beast` number, since 8 + 1 + 1 + 4 + 250 + 7 + 395 = 666.

It is not a de Polignac number, because 81142507395 - 2⁷ = 81142507267 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81142507395.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77481 + ... + 410229.

It is an arithmetic number, because the mean of its divisors is an integer number (5861391250).

Almost surely, 2^81142507395 is an apocalyptic number.

81142507395 is a deficient number, since it is larger than the sum of its proper divisors (59530882605).

81142507395 is a wasteful number, since it uses less digits than its factorization.

81142507395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338179 (or 338176 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 81142507395 in words is "eighty-one billion, one hundred forty-two million, five hundred seven thousand, three hundred ninety-five".