1638630989048 has 8 divisors (see below), whose sum is σ = 3072433104480. Its totient is φ = 819315494520.

The previous prime is 1638630989033. The next prime is 1638630989057. The reversal of 1638630989048 is 8409890368361.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1638630989048² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102414436808 + ... + 102414436823.

It is an arithmetic number, because the mean of its divisors is an integer number (384054138060).

Almost surely, 2^{1638630989048} is an apocalyptic number.

It is an amenable number.

1638630989048 is a deficient number, since it is larger than the sum of its proper divisors (1433802115432).

1638630989048 is a wasteful number, since it uses less digits than its factorization.

1638630989048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204828873637 (or 204828873633 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 65.

The spelling of 1638630989048 in words is "one trillion, six hundred thirty-eight billion, six hundred thirty million, nine hundred eighty-nine thousand, forty-eight".