66625637420 has 48 divisors (see below), whose sum is σ = 141271727520. Its totient is φ = 26391868416.

The previous prime is 66625637413. The next prime is 66625637423. The reversal of 66625637420 is 2473652666.

It is not an unprimeable number, because it can be changed into a prime (66625637423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4795604 + ... + 4809476.

It is an arithmetic number, because the mean of its divisors is an integer number (2943160990).

Almost surely, 2^66625637420 is an apocalyptic number.

It is an amenable number.

66625637420 is an abundant number, since it is smaller than the sum of its proper divisors (74646090100).

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

66625637420 is a wasteful number, since it uses less digits than its factorization.

66625637420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16194 (or 16192 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 66625637420 in words is "sixty-six billion, six hundred twenty-five million, six hundred thirty-seven thousand, four hundred twenty".