1643215662 has 96 divisors (see below), whose sum is σ = 3959414784. Its totient is φ = 488376000.

The previous prime is 1643215649. The next prime is 1643215663. The reversal of 1643215662 is 2665123461.

1643215662 is a `hidden beast` number, since 1 + 64 + 32 + 1 + 566 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643215663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2539423 + ... + 2540069.

It is an arithmetic number, because the mean of its divisors is an integer number (41243904).

Almost surely, 2^1643215662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1643215662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1979707392).

1643215662 is an abundant number, since it is smaller than the sum of its proper divisors (2316199122).

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

1643215662 is a wasteful number, since it uses less digits than its factorization.

1643215662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 891 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1643215662 is about 40536.5965764271. The cubic root of 1643215662 is about 1180.0439660914.

The spelling of 1643215662 in words is "one billion, six hundred forty-three million, two hundred fifteen thousand, six hundred sixty-two".