81526508264 has 16 divisors (see below), whose sum is σ = 160907582400. Its totient is φ = 38617819632.

The previous prime is 81526508263. The next prime is 81526508293. The reversal of 81526508264 is 46280562518.

It is a super-3 number, since 3×81526508264³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81526508263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268179152 + ... + 268179455.

It is an arithmetic number, because the mean of its divisors is an integer number (10056723900).

Almost surely, 2^81526508264 is an apocalyptic number.

It is an amenable number.

81526508264 is a deficient number, since it is larger than the sum of its proper divisors (79381074136).

81526508264 is a wasteful number, since it uses less digits than its factorization.

81526508264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536358632 (or 536358628 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 81526508264 in words is "eighty-one billion, five hundred twenty-six million, five hundred eight thousand, two hundred sixty-four".