81452157451 has 4 divisors (see below), whose sum is σ = 93088179952. Its totient is φ = 69816134952.

The previous prime is 81452157439. The next prime is 81452157487. The reversal of 81452157451 is 15475125418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15475125418 = 2 ⋅7737562709.

It is a cyclic number.

It is not a de Polignac number, because 81452157451 - 2³¹ = 79304673803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81452157398 and 81452157407.

It is not an unprimeable number, because it can be changed into a prime (81452157491) 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, 5818011240 + ... + 5818011253.

It is an arithmetic number, because the mean of its divisors is an integer number (23272044988).

Almost surely, 2^81452157451 is an apocalyptic number.

81452157451 is a deficient number, since it is larger than the sum of its proper divisors (11636022501).

81452157451 is a wasteful number, since it uses less digits than its factorization.

81452157451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11636022500.

The product of its digits is 224000, while the sum is 43.

The spelling of 81452157451 in words is "eighty-one billion, four hundred fifty-two million, one hundred fifty-seven thousand, four hundred fifty-one".