61552120641 has 16 divisors (see below), whose sum is σ = 89560961280. Its totient is φ = 37291563920.

The previous prime is 61552120639. The next prime is 61552120687. The reversal of 61552120641 is 14602125516.

It is a cyclic number.

It is not a de Polignac number, because 61552120641 - 2¹ = 61552120639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61552120601) 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 15 ways as a sum of consecutive naturals, for example, 220335 + ... + 414308.

It is an arithmetic number, because the mean of its divisors is an integer number (5597560080).

Almost surely, 2^61552120641 is an apocalyptic number.

It is an amenable number.

61552120641 is a deficient number, since it is larger than the sum of its proper divisors (28008840639).

61552120641 is a wasteful number, since it uses less digits than its factorization.

61552120641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637596.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 61552120641 in words is "sixty-one billion, five hundred fifty-two million, one hundred twenty thousand, six hundred forty-one".