61161980471 has 4 divisors (see below), whose sum is σ = 61303232592. Its totient is φ = 61020728352.

The previous prime is 61161980447. The next prime is 61161980497. The reversal of 61161980471 is 17408916116.

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

It is a cyclic number.

It is not a de Polignac number, because 61161980471 - 2¹⁸ = 61161718327 is a prime.

It is a super-3 number, since 3×61161980471³ (a number of 33 digits) contains 333 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 (61161910471) 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, 70625411 + ... + 70626276.

It is an arithmetic number, because the mean of its divisors is an integer number (15325808148).

Almost surely, 2^61161980471 is an apocalyptic number.

61161980471 is a deficient number, since it is larger than the sum of its proper divisors (141252121).

61161980471 is a wasteful number, since it uses less digits than its factorization.

61161980471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141252120.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 61161980471 in words is "sixty-one billion, one hundred sixty-one million, nine hundred eighty thousand, four hundred seventy-one".