61661241627231 has 4 divisors (see below), whose sum is σ = 82214988836312. Its totient is φ = 41107494418152.

The previous prime is 61661241627229. The next prime is 61661241627241. The reversal of 61661241627231 is 13272614216616.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61661241627231 - 2¹ = 61661241627229 is a prime.

It is a super-2 number, since 2×61661241627231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661241627241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10276873604536 + ... + 10276873604541.

It is an arithmetic number, because the mean of its divisors is an integer number (20553747209078).

Almost surely, 2^{61661241627231} is an apocalyptic number.

61661241627231 is a deficient number, since it is larger than the sum of its proper divisors (20553747209081).

61661241627231 is a wasteful number, since it uses less digits than its factorization.

61661241627231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20553747209080.

The product of its digits is 870912, while the sum is 48.

The spelling of 61661241627231 in words is "sixty-one trillion, six hundred sixty-one billion, two hundred forty-one million, six hundred twenty-seven thousand, two hundred thirty-one".