61641201522520 has 32 divisors (see below), whose sum is σ = 138823176431520. Its totient is φ = 24633285408000.

The previous prime is 61641201522463. The next prime is 61641201522521. The reversal of 61641201522520 is 2522510214616.

It is a self number, because there is not a number n which added to its sum of digits gives 61641201522520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641201522521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724806981 + ... + 724892020.

It is an arithmetic number, because the mean of its divisors is an integer number (4338224263485).

Almost surely, 2^{61641201522520} is an apocalyptic number.

It is an amenable number.

61641201522520 is an abundant number, since it is smaller than the sum of its proper divisors (77181974909000).

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

61641201522520 is a wasteful number, since it uses less digits than its factorization.

61641201522520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449700075 (or 1449700071 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 61641201522520 in words is "sixty-one trillion, six hundred forty-one billion, two hundred one million, five hundred twenty-two thousand, five hundred twenty".