661562001303 has 64 divisors (see below), whose sum is σ = 1045453381632. Its totient is φ = 364295917440.

The previous prime is 661562001301. The next prime is 661562001311. The reversal of 661562001303 is 303100265166.

It is not a de Polignac number, because 661562001303 - 2¹ = 661562001301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661562001301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20448526 + ... + 20480852.

It is an arithmetic number, because the mean of its divisors is an integer number (16335209088).

Almost surely, 2^661562001303 is an apocalyptic number.

661562001303 is a deficient number, since it is larger than the sum of its proper divisors (383891380329).

661562001303 is a wasteful number, since it uses less digits than its factorization.

661562001303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32684.

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 661562001303 its reverse (303100265166), we get a palindrome (964662266469).

The spelling of 661562001303 in words is "six hundred sixty-one billion, five hundred sixty-two million, one thousand, three hundred three".