4378138305861 has 16 divisors (see below), whose sum is σ = 6233611829760. Its totient is φ = 2727205172160.

The previous prime is 4378138305833. The next prime is 4378138305869. The reversal of 4378138305861 is 1685038318734.

It is not a de Polignac number, because 4378138305861 - 2⁷ = 4378138305733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378138305869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811665510 + ... + 811670903.

It is an arithmetic number, because the mean of its divisors is an integer number (389600739360).

Almost surely, 2^{4378138305861} is an apocalyptic number.

It is an amenable number.

4378138305861 is a deficient number, since it is larger than the sum of its proper divisors (1855473523899).

4378138305861 is a wasteful number, since it uses less digits than its factorization.

4378138305861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623336476.

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 4378138305861 in words is "four trillion, three hundred seventy-eight billion, one hundred thirty-eight million, three hundred five thousand, eight hundred sixty-one".