61630522521 has 4 divisors (see below), whose sum is σ = 82174030032. Its totient is φ = 41087015012.

The previous prime is 61630522517. The next prime is 61630522531. The reversal of 61630522521 is 12522503616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61630522521 - 2² = 61630522517 is a prime.

It is a super-2 number, since 2×61630522521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61630522531) 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 3 ways as a sum of consecutive naturals, for example, 10271753751 + ... + 10271753756.

It is an arithmetic number, because the mean of its divisors is an integer number (20543507508).

Almost surely, 2^61630522521 is an apocalyptic number.

It is an amenable number.

61630522521 is a deficient number, since it is larger than the sum of its proper divisors (20543507511).

61630522521 is a wasteful number, since it uses less digits than its factorization.

61630522521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20543507510.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 61630522521 in words is "sixty-one billion, six hundred thirty million, five hundred twenty-two thousand, five hundred twenty-one".