1645079379438 has 32 divisors (see below), whose sum is σ = 3589311825792. Its totient is φ = 498502274400.

The previous prime is 1645079379401. The next prime is 1645079379469. The reversal of 1645079379438 is 8349739705461.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

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, 7505928 + ... + 7721988.

It is an arithmetic number, because the mean of its divisors is an integer number (112165994556).

Almost surely, 2^{1645079379438} is an apocalyptic number.

1645079379438 is an abundant number, since it is smaller than the sum of its proper divisors (1944232446354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645079379438 is a wasteful number, since it uses less digits than its factorization.

1645079379438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331440.

The product of its (nonzero) digits is 137168640, while the sum is 66.

The spelling of 1645079379438 in words is "one trillion, six hundred forty-five billion, seventy-nine million, three hundred seventy-nine thousand, four hundred thirty-eight".