81411514477 has 4 divisors (see below), whose sum is σ = 82626611776. Its totient is φ = 80196417180.

The previous prime is 81411514463. The next prime is 81411514493. The reversal of 81411514477 is 77441511418.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81411514477 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 (81411512477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607548549 + ... + 607548682.

It is an arithmetic number, because the mean of its divisors is an integer number (20656652944).

Almost surely, 2^81411514477 is an apocalyptic number.

It is an amenable number.

81411514477 is a deficient number, since it is larger than the sum of its proper divisors (1215097299).

81411514477 is a wasteful number, since it uses less digits than its factorization.

81411514477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215097298.

The product of its digits is 125440, while the sum is 43.

The spelling of 81411514477 in words is "eighty-one billion, four hundred eleven million, five hundred fourteen thousand, four hundred seventy-seven".