66470296820 has 48 divisors (see below), whose sum is σ = 148064429520. Its totient is φ = 24979113984.

The previous prime is 66470296757. The next prime is 66470296847. The reversal of 66470296820 is 2869207466.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8681021584 + 57789275236 = 93172^2 + 240394^2 .

It is a super-2 number, since 2×66470296820² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13886 + ... + 364874.

It is an arithmetic number, because the mean of its divisors is an integer number (3084675615).

Almost surely, 2^66470296820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66470296820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74032214760).

66470296820 is an abundant number, since it is smaller than the sum of its proper divisors (81594132700).

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

66470296820 is a wasteful number, since it uses less digits than its factorization.

66470296820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351572 (or 351570 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 66470296820 in words is "sixty-six billion, four hundred seventy million, two hundred ninety-six thousand, eight hundred twenty".