669200421540 has 144 divisors (see below), whose sum is σ = 2204173036800. Its totient is φ = 151241384448.

The previous prime is 669200421503. The next prime is 669200421583. The reversal of 669200421540 is 45124002966.

It is a happy number.

669200421540 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1017100 + ... + 1540419.

It is an arithmetic number, because the mean of its divisors is an integer number (15306757200).

Almost surely, 2^669200421540 is an apocalyptic number.

669200421540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669200421540 is an abundant number, since it is smaller than the sum of its proper divisors (1534972615260).

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

669200421540 is a wasteful number, since it uses less digits than its factorization.

669200421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557634 (or 2557625 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 669200421540 in words is "six hundred sixty-nine billion, two hundred million, four hundred twenty-one thousand, five hundred forty".