81602258407 has 4 divisors (see below), whose sum is σ = 81604560456. Its totient is φ = 81599956360.

The previous prime is 81602258389. The next prime is 81602258447. The reversal of 81602258407 is 70485220618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81602258407 - 2³¹ = 79454774759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81602258447) 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, 1097008 + ... + 1169029.

It is an arithmetic number, because the mean of its divisors is an integer number (20401140114).

Almost surely, 2^81602258407 is an apocalyptic number.

81602258407 is a deficient number, since it is larger than the sum of its proper divisors (2302049).

81602258407 is a wasteful number, since it uses less digits than its factorization.

81602258407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302048.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 81602258407 in words is "eighty-one billion, six hundred two million, two hundred fifty-eight thousand, four hundred seven".