66031610454 has 64 divisors (see below), whose sum is σ = 149962982400. Its totient is φ = 21527277984.

The previous prime is 66031610413. The next prime is 66031610459. The reversal of 66031610454 is 45401613066.

It is a happy number.

66031610454 is a `hidden beast` number, since 6 + 6 + 0 + 31 + 610 + 4 + 5 + 4 = 666.

It is a super-2 number, since 2×66031610454² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66031610459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3999264 + ... + 4015740.

It is an arithmetic number, because the mean of its divisors is an integer number (2343171600).

Almost surely, 2^66031610454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66031610454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74981491200).

66031610454 is an abundant number, since it is smaller than the sum of its proper divisors (83931371946).

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

66031610454 is a wasteful number, since it uses less digits than its factorization.

66031610454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18114 (or 18108 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 66031610454 in words is "sixty-six billion, thirty-one million, six hundred ten thousand, four hundred fifty-four".