61604551523 has 16 divisors (see below), whose sum is σ = 66614304000. Its totient is φ = 56772241632.

The previous prime is 61604551511. The next prime is 61604551571. The reversal of 61604551523 is 32515540616.

It is a cyclic number.

It is not a de Polignac number, because 61604551523 - 2¹⁸ = 61604289379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61604551583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4970348 + ... + 4982726.

It is an arithmetic number, because the mean of its divisors is an integer number (4163394000).

Almost surely, 2^61604551523 is an apocalyptic number.

61604551523 is a deficient number, since it is larger than the sum of its proper divisors (5009752477).

61604551523 is a wasteful number, since it uses less digits than its factorization.

61604551523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19514.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 61604551523 in words is "sixty-one billion, six hundred four million, five hundred fifty-one thousand, five hundred twenty-three".