61210071715621 has 8 divisors (see below), whose sum is σ = 61778863618560. Its totient is φ = 60641411296752.

The previous prime is 61210071715607. The next prime is 61210071715649. The reversal of 61210071715621 is 12651717001216.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61210071715621 - 2²⁷ = 61209937497893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61210071715601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31935505 + ... + 33797878.

It is an arithmetic number, because the mean of its divisors is an integer number (7722357952320).

Almost surely, 2^{61210071715621} is an apocalyptic number.

It is an amenable number.

61210071715621 is a deficient number, since it is larger than the sum of its proper divisors (568791902939).

61210071715621 is a wasteful number, since it uses less digits than its factorization.

61210071715621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65742035.

The product of its (nonzero) digits is 35280, while the sum is 40.

Adding to 61210071715621 its reverse (12651717001216), we get a palindrome (73861788716837).

The spelling of 61210071715621 in words is "sixty-one trillion, two hundred ten billion, seventy-one million, seven hundred fifteen thousand, six hundred twenty-one".