61163474981 has 4 divisors (see below), whose sum is σ = 69901114272. Its totient is φ = 52425835692.

The previous prime is 61163474941. The next prime is 61163475011. The reversal of 61163474981 is 18947436116.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61163474981 - 2¹⁴ = 61163458597 is a prime.

It is a super-2 number, since 2×61163474981² (a number of 22 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 (61163474941) 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, 4368819635 + ... + 4368819648.

It is an arithmetic number, because the mean of its divisors is an integer number (17475278568).

Almost surely, 2^61163474981 is an apocalyptic number.

It is an amenable number.

61163474981 is a deficient number, since it is larger than the sum of its proper divisors (8737639291).

61163474981 is an equidigital number, since it uses as much as digits as its factorization.

61163474981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8737639290.

The product of its digits is 870912, while the sum is 50.

The spelling of 61163474981 in words is "sixty-one billion, one hundred sixty-three million, four hundred seventy-four thousand, nine hundred eighty-one".