81177558830 has 16 divisors (see below), whose sum is σ = 150833142144. Its totient is φ = 31423571040.

The previous prime is 81177558811. The next prime is 81177558871. The reversal of 81177558830 is 3885577118.

It is a super-2 number, since 2×81177558830² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130931237 + ... + 130931856.

It is an arithmetic number, because the mean of its divisors is an integer number (9427071384).

Almost surely, 2^81177558830 is an apocalyptic number.

81177558830 is a deficient number, since it is larger than the sum of its proper divisors (69655583314).

81177558830 is a wasteful number, since it uses less digits than its factorization.

81177558830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261863131.

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 81177558830 in words is "eighty-one billion, one hundred seventy-seven million, five hundred fifty-eight thousand, eight hundred thirty".