66469349520 has 160 divisors (see below), whose sum is σ = 261657181440. Its totient is φ = 15192990720.

The previous prime is 66469349497. The next prime is 66469349543. The reversal of 66469349520 is 2594396466.

66469349520 is a `hidden beast` number, since 6 + 6 + 46 + 93 + 495 + 20 = 666.

66469349520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66469349497) and next prime (66469349543).

It is a super-2 number, since 2×66469349520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2182941 + ... + 2213180.

It is an arithmetic number, because the mean of its divisors is an integer number (1635357384).

Almost surely, 2^66469349520 is an apocalyptic number.

66469349520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66469349520 is an abundant number, since it is smaller than the sum of its proper divisors (195187831920).

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

66469349520 is a wasteful number, since it uses less digits than its factorization.

66469349520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396150 (or 4396138 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 66469349520 in words is "sixty-six billion, four hundred sixty-nine million, three hundred forty-nine thousand, five hundred twenty".