4378845019761 has 9 divisors (see below), whose sum is σ = 6325007429689. Its totient is φ = 2919225828036.

The previous prime is 4378845019721. The next prime is 4378845019799. The reversal of 4378845019761 is 1679105488734.

The square root of 4378845019761 is 2092569.

It is a perfect power (a square), and thus also a powerful number.

4378845019761 is a `hidden beast` number, since 4 + 37 + 8 + 8 + 4 + 501 + 97 + 6 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 4378845019761 - 2²³ = 4378836631153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4378845019721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5928946 + ... + 6626468.

Almost surely, 2^{4378845019761} is an apocalyptic number.

4378845019761 is the 2092569-th square number.

4378845019761 is the 1046285-th centered octagonal number.

It is an amenable number.

4378845019761 is a deficient number, since it is larger than the sum of its proper divisors (1946162409928).

4378845019761 is an frugal number, since it uses more digits than its factorization.

4378845019761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395052 (or 697526 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 4378845019761 in words is "four trillion, three hundred seventy-eight billion, eight hundred forty-five million, nineteen thousand, seven hundred sixty-one".