81462468457 has 2 divisors, whose sum is σ = 81462468458. Its totient is φ = 81462468456.

The previous prime is 81462468449. The next prime is 81462468491. The reversal of 81462468457 is 75486426418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52406197776 + 29056270681 = 228924^2 + 170459^2 .

It is a cyclic number.

It is not a de Polignac number, because 81462468457 - 2³ = 81462468449 is a prime.

It is a super-2 number, since 2×81462468457² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81462468398 and 81462468407.

It is not a weakly prime, because it can be changed into another prime (81462468757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40731234228 + 40731234229.

It is an arithmetic number, because the mean of its divisors is an integer number (40731234229).

Almost surely, 2^81462468457 is an apocalyptic number.

It is an amenable number.

81462468457 is a deficient number, since it is larger than the sum of its proper divisors (1).

81462468457 is an equidigital number, since it uses as much as digits as its factorization.

81462468457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10321920, while the sum is 55.

The spelling of 81462468457 in words is "eighty-one billion, four hundred sixty-two million, four hundred sixty-eight thousand, four hundred fifty-seven".