81302201253 has 48 divisors (see below), whose sum is σ = 150890564160. Its totient is φ = 42884668512.

The previous prime is 81302201209. The next prime is 81302201261. The reversal of 81302201253 is 35210220318.

It is not a de Polignac number, because 81302201253 - 2¹³ = 81302193061 is a prime.

It is a super-2 number, since 2×81302201253² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81302201263) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2346375 + ... + 2380772.

It is an arithmetic number, because the mean of its divisors is an integer number (3143553420).

Almost surely, 2^81302201253 is an apocalyptic number.

It is an amenable number.

81302201253 is a deficient number, since it is larger than the sum of its proper divisors (69588362907).

81302201253 is a wasteful number, since it uses less digits than its factorization.

81302201253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727183 (or 4727170 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 81302201253 in words is "eighty-one billion, three hundred two million, two hundred one thousand, two hundred fifty-three".