81480748915 has 16 divisors (see below), whose sum is σ = 99256867200. Its totient is φ = 64201992192.

The previous prime is 81480748903. The next prime is 81480748919. The reversal of 81480748915 is 51984708418.

It is a cyclic number.

It is not a de Polignac number, because 81480748915 - 2⁵ = 81480748883 is a prime.

It is a super-2 number, since 2×81480748915² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81480748919) 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, 90622 + ... + 413731.

It is an arithmetic number, because the mean of its divisors is an integer number (6203554200).

Almost surely, 2^81480748915 is an apocalyptic number.

81480748915 is a deficient number, since it is larger than the sum of its proper divisors (17776118285).

81480748915 is a wasteful number, since it uses less digits than its factorization.

81480748915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504846.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 81480748915 in words is "eighty-one billion, four hundred eighty million, seven hundred forty-eight thousand, nine hundred fifteen".