661571524043 has 16 divisors (see below), whose sum is σ = 697741382400. Its totient is φ = 625537715040.

The previous prime is 661571524037. The next prime is 661571524069. The reversal of 661571524043 is 340425175166.

It is a cyclic number.

It is not a de Polignac number, because 661571524043 - 2⁶ = 661571523979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661571523985 and 661571524003.

It is not an unprimeable number, because it can be changed into a prime (661571524543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25696205 + ... + 25721937.

It is an arithmetic number, because the mean of its divisors is an integer number (43608836400).

Almost surely, 2^661571524043 is an apocalyptic number.

661571524043 is a deficient number, since it is larger than the sum of its proper divisors (36169858357).

661571524043 is a wasteful number, since it uses less digits than its factorization.

661571524043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28322.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 661571524043 in words is "six hundred sixty-one billion, five hundred seventy-one million, five hundred twenty-four thousand, forty-three".