61121766421 has 8 divisors (see below), whose sum is σ = 62975562624. Its totient is φ = 59278594320.

The previous prime is 61121766397. The next prime is 61121766439. The reversal of 61121766421 is 12466712116.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61121766421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121766721) 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, 2644345 + ... + 2667358.

It is an arithmetic number, because the mean of its divisors is an integer number (7871945328).

Almost surely, 2^61121766421 is an apocalyptic number.

It is an amenable number.

61121766421 is a deficient number, since it is larger than the sum of its proper divisors (1853796203).

61121766421 is a wasteful number, since it uses less digits than its factorization.

61121766421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312051.

The product of its digits is 24192, while the sum is 37.

The spelling of 61121766421 in words is "sixty-one billion, one hundred twenty-one million, seven hundred sixty-six thousand, four hundred twenty-one".