81420654747 has 8 divisors (see below), whose sum is σ = 109167359040. Its totient is φ = 53977193480.

The previous prime is 81420654737. The next prime is 81420654817. The reversal of 81420654747 is 74745602418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81420654747 - 2⁶ = 81420654683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81420654696 and 81420654705.

It is not an unprimeable number, because it can be changed into a prime (81420654727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75810129 + ... + 75811202.

It is an arithmetic number, because the mean of its divisors is an integer number (13645919880).

Almost surely, 2^81420654747 is an apocalyptic number.

81420654747 is a deficient number, since it is larger than the sum of its proper divisors (27746704293).

81420654747 is a wasteful number, since it uses less digits than its factorization.

81420654747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151621513.

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

The spelling of 81420654747 in words is "eighty-one billion, four hundred twenty million, six hundred fifty-four thousand, seven hundred forty-seven".