81477940607 has 8 divisors (see below), whose sum is σ = 93181832832. Its totient is φ = 69790095000.

The previous prime is 81477940591. The next prime is 81477940619. The reversal of 81477940607 is 70604977418.

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 81477940607 - 2⁴ = 81477940591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81477940627) 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, 4000769 + ... + 4021082.

It is an arithmetic number, because the mean of its divisors is an integer number (11647729104).

Almost surely, 2^81477940607 is an apocalyptic number.

81477940607 is a deficient number, since it is larger than the sum of its proper divisors (11703892225).

81477940607 is a wasteful number, since it uses less digits than its factorization.

81477940607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8023309.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 81477940607 in words is "eighty-one billion, four hundred seventy-seven million, nine hundred forty thousand, six hundred seven".