81215850480 has 80 divisors (see below), whose sum is σ = 254122199424. Its totient is φ = 21455146240.

The previous prime is 81215850427. The next prime is 81215850503. The reversal of 81215850480 is 8405851218.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1555626 + ... + 1606985.

Almost surely, 2^81215850480 is an apocalyptic number.

81215850480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81215850480 is an abundant number, since it is smaller than the sum of its proper divisors (172906348944).

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

81215850480 is a wasteful number, since it uses less digits than its factorization.

81215850480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162734 (or 3162728 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 42.

The spelling of 81215850480 in words is "eighty-one billion, two hundred fifteen million, eight hundred fifty thousand, four hundred eighty".