81548592207 has 8 divisors (see below), whose sum is σ = 108810654384. Its totient is φ = 54326129088.

The previous prime is 81548592137. The next prime is 81548592247. The reversal of 81548592207 is 70229584518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81548592207 - 2¹⁶ = 81548526671 is a prime.

It is a super-2 number, since 2×81548592207² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81548592207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81548592247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9894958 + ... + 9903195.

It is an arithmetic number, because the mean of its divisors is an integer number (13601331798).

Almost surely, 2^81548592207 is an apocalyptic number.

81548592207 is a deficient number, since it is larger than the sum of its proper divisors (27262062177).

81548592207 is a wasteful number, since it uses less digits than its factorization.

81548592207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19799529.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 81548592207 in words is "eighty-one billion, five hundred forty-eight million, five hundred ninety-two thousand, two hundred seven".