61671000521 has 16 divisors (see below), whose sum is σ = 70481980800. Its totient is φ = 53456295168.

The previous prime is 61671000449. The next prime is 61671000533. The reversal of 61671000521 is 12500017616.

It is a cyclic number.

It is not a de Polignac number, because 61671000521 - 2³⁰ = 60597258697 is a prime.

It is a super-2 number, since 2×61671000521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61671000541) 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, 220811 + ... + 414848.

It is an arithmetic number, because the mean of its divisors is an integer number (4405123800).

Almost surely, 2^61671000521 is an apocalyptic number.

It is an amenable number.

61671000521 is a deficient number, since it is larger than the sum of its proper divisors (8810980279).

61671000521 is a wasteful number, since it uses less digits than its factorization.

61671000521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636128.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 61671000521 in words is "sixty-one billion, six hundred seventy-one million, five hundred twenty-one", and thus it is an aban number.