820949470425 has 216 divisors, whose sum is σ = 1777946579136. Its totient is φ = 360733927680.

The previous prime is 820949470421. The next prime is 820949470433. The reversal of 820949470425 is 524074949028.

It is a happy number.

820949470425 is a `hidden beast` number, since 8 + 209 + 4 + 9 + 4 + 7 + 0 + 425 = 666.

It is not a de Polignac number, because 820949470425 - 2² = 820949470421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820949470421) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 33845652 + ... + 33869898.

Almost surely, 2^820949470425 is an apocalyptic number.

It is an amenable number.

820949470425 is an abundant number, since it is smaller than the sum of its proper divisors (956997108711).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820949470425 is a wasteful number, since it uses less digits than its factorization.

820949470425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24397 (or 24382 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 820949470425 in words is "eight hundred twenty billion, nine hundred forty-nine million, four hundred seventy thousand, four hundred twenty-five".