1643492650078 has 32 divisors (see below), whose sum is σ = 2710971325440. Its totient is φ = 744306770880.

The previous prime is 1643492650043. The next prime is 1643492650081. The reversal of 1643492650078 is 8700562943461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8306775 + ... + 8502322.

It is an arithmetic number, because the mean of its divisors is an integer number (84717853920).

It is a 1-persistent number, because it is pandigital, but 2⋅1643492650078 = 3286985300156 is not.

Almost surely, 2^{1643492650078} is an apocalyptic number.

1643492650078 is a deficient number, since it is larger than the sum of its proper divisors (1067478675362).

1643492650078 is a wasteful number, since it uses less digits than its factorization.

1643492650078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16809232.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 1643492650078 in words is "one trillion, six hundred forty-three billion, four hundred ninety-two million, six hundred fifty thousand, seventy-eight".