81177429048 has 64 divisors (see below), whose sum is σ = 206155238400. Its totient is φ = 26632477440.

The previous prime is 81177429043. The next prime is 81177429077. The reversal of 81177429048 is 84092477118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81177429043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 790843 + ... + 887573.

It is an arithmetic number, because the mean of its divisors is an integer number (3221175600).

Almost surely, 2^81177429048 is an apocalyptic number.

It is an amenable number.

81177429048 is an abundant number, since it is smaller than the sum of its proper divisors (124977809352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81177429048 is a wasteful number, since it uses less digits than its factorization.

81177429048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97292 (or 97288 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 81177429048 in words is "eighty-one billion, one hundred seventy-seven million, four hundred twenty-nine thousand, forty-eight".