81451451257 has 8 divisors (see below), whose sum is σ = 91920133440. Its totient is φ = 71493436560.

The previous prime is 81451451233. The next prime is 81451451287. The reversal of 81451451257 is 75215415418.

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 81451451257 - 2¹⁹ = 81450926969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81451451287) 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, 127666533 + ... + 127667170.

It is an arithmetic number, because the mean of its divisors is an integer number (11490016680).

Almost surely, 2^81451451257 is an apocalyptic number.

It is an amenable number.

81451451257 is a deficient number, since it is larger than the sum of its proper divisors (10468682183).

81451451257 is a wasteful number, since it uses less digits than its factorization.

81451451257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255333743.

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

The spelling of 81451451257 in words is "eighty-one billion, four hundred fifty-one million, four hundred fifty-one thousand, two hundred fifty-seven".