378999065641 has 27 divisors (see below), whose sum is σ = 455717687607. Its totient is φ = 314266291920.

The previous prime is 378999065623. The next prime is 378999065677. The reversal of 378999065641 is 146560999873.

The square root of 378999065641 is 615629.

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

It can be written as a sum of positive squares in only one way, i.e., 12978905625 + 366020160016 = 113925^2 + 604996^2 .

It is not a de Polignac number, because 378999065641 - 2⁷ = 378999065513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378999015641) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 133590075 + ... + 133592911.

Almost surely, 2^378999065641 is an apocalyptic number.

378999065641 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

378999065641 is the 615629-th square number.

378999065641 is the 307815-th centered octagonal number.

It is an amenable number.

378999065641 is a deficient number, since it is larger than the sum of its proper divisors (76718621966).

378999065641 is an frugal number, since it uses more digits than its factorization.

378999065641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5750 (or 2875 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 67.

The spelling of 378999065641 in words is "three hundred seventy-eight billion, nine hundred ninety-nine million, sixty-five thousand, six hundred forty-one".