306699978025 has 27 divisors (see below), whose sum is σ = 442427031351. Its totient is φ = 210295265040.

The previous prime is 306699978023. The next prime is 306699978061. The reversal of 306699978025 is 520879996603.

The square root of 306699978025 is 553805.

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., 110411992089 + 196287985936 = 332283^2 + 443044^2 .

It is not a de Polignac number, because 306699978025 - 2¹ = 306699978023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (306699978023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19375264 + ... + 19391086.

Almost surely, 2^306699978025 is an apocalyptic number.

306699978025 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

306699978025 is the 553805-th square number.

306699978025 is the 276903-rd centered octagonal number.

It is an amenable number.

306699978025 is a deficient number, since it is larger than the sum of its proper divisors (135727053326).

306699978025 is an frugal number, since it uses more digits than its factorization.

306699978025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31670 (or 15835 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 64.

Multiplying 306699978025 by its sum of digits (64), we get a square (19628798593600 = 4430440²).

The spelling of 306699978025 in words is "three hundred six billion, six hundred ninety-nine million, nine hundred seventy-eight thousand, twenty-five".