66250641660 has 96 divisors (see below), whose sum is σ = 212064652800. Its totient is φ = 15138532608.

The previous prime is 66250641637. The next prime is 66250641661. The reversal of 66250641660 is 6614605266.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66250641661) 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, 1522891 + ... + 1565789.

It is an arithmetic number, because the mean of its divisors is an integer number (2209006800).

Almost surely, 2^66250641660 is an apocalyptic number.

66250641660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66250641660 is an abundant number, since it is smaller than the sum of its proper divisors (145814011140).

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

66250641660 is a wasteful number, since it uses less digits than its factorization.

66250641660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46595 (or 46593 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 66250641660 in words is "sixty-six billion, two hundred fifty million, six hundred forty-one thousand, six hundred sixty".