81307760498 has 4 divisors (see below), whose sum is σ = 121961640750. Its totient is φ = 40653880248.

The previous prime is 81307760459. The next prime is 81307760519. The reversal of 81307760498 is 89406770318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 56628293089 + 24679467409 = 237967^2 + 157097^2 .

It is a super-2 number, since 2×81307760498² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20326940123 + ... + 20326940126.

Almost surely, 2^81307760498 is an apocalyptic number.

81307760498 is a deficient number, since it is larger than the sum of its proper divisors (40653880252).

81307760498 is a wasteful number, since it uses less digits than its factorization.

81307760498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40653880251.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 81307760498 in words is "eighty-one billion, three hundred seven million, seven hundred sixty thousand, four hundred ninety-eight".