644241020546 has 16 divisors (see below), whose sum is σ = 1018091412960. Its totient is φ = 304906174560.

The previous prime is 644241020483. The next prime is 644241020597. The reversal of 644241020546 is 645020142446.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7194491 + ... + 7283486.

It is an arithmetic number, because the mean of its divisors is an integer number (63630713310).

Almost surely, 2^644241020546 is an apocalyptic number.

644241020546 is a deficient number, since it is larger than the sum of its proper divisors (373850392414).

644241020546 is a wasteful number, since it uses less digits than its factorization.

644241020546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14479169.

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 644241020546 in words is "six hundred forty-four billion, two hundred forty-one million, twenty thousand, five hundred forty-six".