61621175575661 has 16 divisors (see below), whose sum is σ = 66404524638144. Its totient is φ = 56844008959104.

The previous prime is 61621175575621. The next prime is 61621175575697. The reversal of 61621175575661 is 16657557112616.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61621175575661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61621175575661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61621175575621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1040113106 + ... + 1040172348.

It is an arithmetic number, because the mean of its divisors is an integer number (4150282789884).

Almost surely, 2^{61621175575661} is an apocalyptic number.

It is an amenable number.

61621175575661 is a deficient number, since it is larger than the sum of its proper divisors (4783349062483).

61621175575661 is a wasteful number, since it uses less digits than its factorization.

61621175575661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110060.

The product of its digits is 15876000, while the sum is 59.

The spelling of 61621175575661 in words is "sixty-one trillion, six hundred twenty-one billion, one hundred seventy-five million, five hundred seventy-five thousand, six hundred sixty-one".