66097012420 has 24 divisors (see below), whose sum is σ = 138809525400. Its totient is φ = 26437700352.

The previous prime is 66097012363. The next prime is 66097012439. The reversal of 66097012420 is 2421079066.

It can be written as a sum of positive squares in 4 ways, for example, as 1458017856 + 64638994564 = 38184^2 + 254242^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66097012420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562546 + ... + 669814.

It is an arithmetic number, because the mean of its divisors is an integer number (5783730225).

Almost surely, 2^66097012420 is an apocalyptic number.

It is an amenable number.

66097012420 is an abundant number, since it is smaller than the sum of its proper divisors (72712512980).

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

66097012420 is a wasteful number, since it uses less digits than its factorization.

66097012420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138087 (or 138085 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 66097012420 in words is "sixty-six billion, ninety-seven million, twelve thousand, four hundred twenty".