213642563640 has 64 divisors (see below), whose sum is σ = 699193848960. Its totient is φ = 51792136320.

The previous prime is 213642563639. The next prime is 213642563647. The reversal of 213642563640 is 46365246312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213642563592 and 213642563601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213642563647) 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, 80923894 + ... + 80926533.

It is an arithmetic number, because the mean of its divisors is an integer number (10924903890).

Almost surely, 2^213642563640 is an apocalyptic number.

213642563640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213642563640 is an abundant number, since it is smaller than the sum of its proper divisors (485551285320).

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

213642563640 is a wasteful number, since it uses less digits than its factorization.

213642563640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161850452 (or 161850448 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 213642563640 in words is "two hundred thirteen billion, six hundred forty-two million, five hundred sixty-three thousand, six hundred forty".