643900650070 has 8 divisors (see below), whose sum is σ = 1159021170144. Its totient is φ = 257560260024.

The previous prime is 643900650067. The next prime is 643900650073. The reversal of 643900650070 is 70056009346.

It is an interprime number because it is at equal distance from previous prime (643900650067) and next prime (643900650073).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643900650073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32195032494 + ... + 32195032513.

It is an arithmetic number, because the mean of its divisors is an integer number (144877646268).

Almost surely, 2^643900650070 is an apocalyptic number.

643900650070 is a deficient number, since it is larger than the sum of its proper divisors (515120520074).

643900650070 is a wasteful number, since it uses less digits than its factorization.

643900650070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64390065014.

The product of its (nonzero) digits is 136080, while the sum is 40.

The spelling of 643900650070 in words is "six hundred forty-three billion, nine hundred million, six hundred fifty thousand, seventy".