81461298550 has 24 divisors (see below), whose sum is σ = 151636785696. Its totient is φ = 32558977440.

The previous prime is 81461298533. The next prime is 81461298551. The reversal of 81461298550 is 5589216418.

It is a super-2 number, since 2×81461298550² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81461298494 and 81461298503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81461298551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574062 + ... + 701761.

It is an arithmetic number, because the mean of its divisors is an integer number (6318199404).

Almost surely, 2^81461298550 is an apocalyptic number.

81461298550 is a deficient number, since it is larger than the sum of its proper divisors (70175487146).

81461298550 is a wasteful number, since it uses less digits than its factorization.

81461298550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277112 (or 1277107 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 81461298550 in words is "eighty-one billion, four hundred sixty-one million, two hundred ninety-eight thousand, five hundred fifty".