61330778306161 has 16 divisors (see below), whose sum is σ = 76152035159424. Its totient is φ = 48096022189824.

The previous prime is 61330778306107. The next prime is 61330778306191. The reversal of 61330778306161 is 16160387703316.

It is not a de Polignac number, because 61330778306161 - 2¹⁵ = 61330778273393 is a prime.

It is a super-2 number, since 2×61330778306161² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61330778306099 and 61330778306108.

It is not an unprimeable number, because it can be changed into a prime (61330778306191) 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, 2982133951 + ... + 2982154516.

It is an arithmetic number, because the mean of its divisors is an integer number (4759502197464).

Almost surely, 2^{61330778306161} is an apocalyptic number.

It is an amenable number.

61330778306161 is a deficient number, since it is larger than the sum of its proper divisors (14821256853263).

61330778306161 is a wasteful number, since it uses less digits than its factorization.

61330778306161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964288600.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 61330778306161 in words is "sixty-one trillion, three hundred thirty billion, seven hundred seventy-eight million, three hundred six thousand, one hundred sixty-one".