81510279153 has 16 divisors (see below), whose sum is σ = 108891182400. Its totient is φ = 54234861120.

The previous prime is 81510279139. The next prime is 81510279197. The reversal of 81510279153 is 35197201518.

It is not a de Polignac number, because 81510279153 - 2⁶ = 81510279089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81510279553) 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, 4778043 + ... + 4795071.

It is an arithmetic number, because the mean of its divisors is an integer number (6805698900).

Almost surely, 2^81510279153 is an apocalyptic number.

It is an amenable number.

81510279153 is a deficient number, since it is larger than the sum of its proper divisors (27380903247).

81510279153 is a wasteful number, since it uses less digits than its factorization.

81510279153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20032.

The product of its (nonzero) digits is 75600, while the sum is 42.

The spelling of 81510279153 in words is "eighty-one billion, five hundred ten million, two hundred seventy-nine thousand, one hundred fifty-three".