642240100433644 has 12 divisors (see below), whose sum is σ = 1124106039895104. Its totient is φ = 321066946177904.

The previous prime is 642240100433599. The next prime is 642240100433699. The reversal of 642240100433644 is 446334001042246.

It is a self number, because there is not a number n which added to its sum of digits gives 642240100433644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13275982519 + ... + 13276030894.

It is an arithmetic number, because the mean of its divisors is an integer number (93675503324592).

Almost surely, 2^{642240100433644} is an apocalyptic number.

It is an amenable number.

642240100433644 is a deficient number, since it is larger than the sum of its proper divisors (481865939461460).

642240100433644 is a wasteful number, since it uses less digits than its factorization.

642240100433644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26552019464 (or 26552019462 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 43.

The spelling of 642240100433644 in words is "six hundred forty-two trillion, two hundred forty billion, one hundred million, four hundred thirty-three thousand, six hundred forty-four".