65606991450 has 1152 divisors, whose sum is σ = 243113011200. Its totient is φ = 11321856000.

The previous prime is 65606991449. The next prime is 65606991451. The reversal of 65606991450 is 5419960656.

It is an interprime number because it is at equal distance from previous prime (65606991449) and next prime (65606991451).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 65606991393 and 65606991402.

It is not an unprimeable number, because it can be changed into a prime (65606991451) by changing a digit.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 1075524420 + ... + 1075524480.

It is an arithmetic number, because the mean of its divisors is an integer number (211035600).

Almost surely, 2^65606991450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65606991450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121556505600).

65606991450 is an abundant number, since it is smaller than the sum of its proper divisors (177506019750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65606991450 is a wasteful number, since it uses less digits than its factorization.

65606991450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 51.

The spelling of 65606991450 in words is "sixty-five billion, six hundred six million, nine hundred ninety-one thousand, four hundred fifty".