61421216536 has 16 divisors (see below), whose sum is σ = 119135980800. Its totient is φ = 29651621664.

The previous prime is 61421216509. The next prime is 61421216539. The reversal of 61421216536 is 63561212416.

It is a junction number, because it is equal to n+sod(n) for n = 61421216495 and 61421216504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61421216539) 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, 132373080 + ... + 132373543.

It is an arithmetic number, because the mean of its divisors is an integer number (7445998800).

Almost surely, 2^61421216536 is an apocalyptic number.

It is an amenable number.

61421216536 is a deficient number, since it is larger than the sum of its proper divisors (57714764264).

61421216536 is a wasteful number, since it uses less digits than its factorization.

61421216536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264746658 (or 264746654 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The spelling of 61421216536 in words is "sixty-one billion, four hundred twenty-one million, two hundred sixteen thousand, five hundred thirty-six".