620812949661 has 12 divisors (see below), whose sum is σ = 915809174592. Its totient is φ = 405069442056.

The previous prime is 620812949621. The next prime is 620812949699. The reversal of 620812949661 is 166949218026.

620812949661 is a `hidden beast` number, since 6 + 20 + 8 + 129 + 496 + 6 + 1 = 666.

It is not a de Polignac number, because 620812949661 - 2⁹ = 620812949149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 620812949598 and 620812949607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620812949621) 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 11 ways as a sum of consecutive naturals, for example, 733821031 + ... + 733821876.

It is an arithmetic number, because the mean of its divisors is an integer number (76317431216).

Almost surely, 2^620812949661 is an apocalyptic number.

It is an amenable number.

620812949661 is a deficient number, since it is larger than the sum of its proper divisors (294996224931).

620812949661 is a wasteful number, since it uses less digits than its factorization.

620812949661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467642960 (or 1467642957 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 620812949661 in words is "six hundred twenty billion, eight hundred twelve million, nine hundred forty-nine thousand, six hundred sixty-one".