320310061551 has 32 divisors (see below), whose sum is σ = 488471497920. Its totient is φ = 207350986752.

The previous prime is 320310061541. The next prime is 320310061583. The reversal of 320310061551 is 155160013023.

320310061551 is a `hidden beast` number, since 3 + 2 + 0 + 3 + 100 + 6 + 1 + 551 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-320310061551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320310061541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1014990 + ... + 1292603.

It is an arithmetic number, because the mean of its divisors is an integer number (15264734310).

Almost surely, 2^320310061551 is an apocalyptic number.

320310061551 is a deficient number, since it is larger than the sum of its proper divisors (168161436369).

320310061551 is a wasteful number, since it uses less digits than its factorization.

320310061551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307752 (or 2307746 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

Adding to 320310061551 its reverse (155160013023), we get a palindrome (475470074574).

The spelling of 320310061551 in words is "three hundred twenty billion, three hundred ten million, sixty-one thousand, five hundred fifty-one".