643370461623 has 6 divisors (see below), whose sum is σ = 929312889024. Its totient is φ = 428913641076.

The previous prime is 643370461619. The next prime is 643370461627. The reversal of 643370461623 is 326164073346.

643370461623 is a `hidden beast` number, since 6 + 4 + 3 + 3 + 7 + 0 + 4 + 616 + 23 = 666.

It is an interprime number because it is at equal distance from previous prime (643370461619) and next prime (643370461627).

It is not a de Polignac number, because 643370461623 - 2² = 643370461619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643370461627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35742803415 + ... + 35742803432.

It is an arithmetic number, because the mean of its divisors is an integer number (154885481504).

Almost surely, 2^643370461623 is an apocalyptic number.

643370461623 is a deficient number, since it is larger than the sum of its proper divisors (285942427401).

643370461623 is a wasteful number, since it uses less digits than its factorization.

643370461623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71485606853 (or 71485606850 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 45.

The spelling of 643370461623 in words is "six hundred forty-three billion, three hundred seventy million, four hundred sixty-one thousand, six hundred twenty-three".