81553415414 has 4 divisors (see below), whose sum is σ = 122330123124. Its totient is φ = 40776707706.

The previous prime is 81553415407. The next prime is 81553415429. The reversal of 81553415414 is 41451435518.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20388353852 + ... + 20388353855.

It is an arithmetic number, because the mean of its divisors is an integer number (30582530781).

Almost surely, 2^81553415414 is an apocalyptic number.

81553415414 is a deficient number, since it is larger than the sum of its proper divisors (40776707710).

81553415414 is a wasteful number, since it uses less digits than its factorization.

81553415414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40776707709.

The product of its digits is 192000, while the sum is 41.

The spelling of 81553415414 in words is "eighty-one billion, five hundred fifty-three million, four hundred fifteen thousand, four hundred fourteen".