378838341661 has 32 divisors (see below), whose sum is σ = 439450437888. Its totient is φ = 323463060480.

The previous prime is 378838341659. The next prime is 378838341683. The reversal of 378838341661 is 166143838873.

It is a cyclic number.

It is not a de Polignac number, because 378838341661 - 2¹ = 378838341659 is a prime.

It is a super-2 number, since 2×378838341661² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 378838341596 and 378838341605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378838341361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4935966 + ... + 5012128.

It is an arithmetic number, because the mean of its divisors is an integer number (13732826184).

Almost surely, 2^378838341661 is an apocalyptic number.

It is an amenable number.

378838341661 is a deficient number, since it is larger than the sum of its proper divisors (60612096227).

378838341661 is a wasteful number, since it uses less digits than its factorization.

378838341661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76581.

The product of its digits is 13934592, while the sum is 58.

The spelling of 378838341661 in words is "three hundred seventy-eight billion, eight hundred thirty-eight million, three hundred forty-one thousand, six hundred sixty-one".