81965470461 has 32 divisors (see below), whose sum is σ = 131129886720. Its totient is φ = 44526106944.

The previous prime is 81965470459. The next prime is 81965470463. The reversal of 81965470461 is 16407456918.

It is an interprime number because it is at equal distance from previous prime (81965470459) and next prime (81965470463).

It is not a de Polignac number, because 81965470461 - 2¹ = 81965470459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81965470463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 441826 + ... + 599283.

It is an arithmetic number, because the mean of its divisors is an integer number (4097808960).

Almost surely, 2^81965470461 is an apocalyptic number.

It is an amenable number.

81965470461 is a deficient number, since it is larger than the sum of its proper divisors (49164416259).

81965470461 is a wasteful number, since it uses less digits than its factorization.

81965470461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041305.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 81965470461 in words is "eighty-one billion, nine hundred sixty-five million, four hundred seventy thousand, four hundred sixty-one".