81526378156 has 6 divisors (see below), whose sum is σ = 142671161780. Its totient is φ = 40763189076.

The previous prime is 81526378147. The next prime is 81526378159. The reversal of 81526378156 is 65187362518.

It is a super-2 number, since 2×81526378156² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81526378159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190797266 + ... + 10190797273.

Almost surely, 2^81526378156 is an apocalyptic number.

It is an amenable number.

81526378156 is a deficient number, since it is larger than the sum of its proper divisors (61144783624).

81526378156 is a wasteful number, since it uses less digits than its factorization.

81526378156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20381594543 (or 20381594541 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 52.

The spelling of 81526378156 in words is "eighty-one billion, five hundred twenty-six million, three hundred seventy-eight thousand, one hundred fifty-six".