61690516361 has 4 divisors (see below), whose sum is σ = 63357827652. Its totient is φ = 60023205072.

The previous prime is 61690516357. The next prime is 61690516387. The reversal of 61690516361 is 16361509616.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37247070025 + 24443446336 = 192995^2 + 156344^2 .

It is a cyclic number.

It is not a de Polignac number, because 61690516361 - 2² = 61690516357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61690516961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833655590 + ... + 833655663.

It is an arithmetic number, because the mean of its divisors is an integer number (15839456913).

Almost surely, 2^61690516361 is an apocalyptic number.

It is an amenable number.

61690516361 is a deficient number, since it is larger than the sum of its proper divisors (1667311291).

61690516361 is a wasteful number, since it uses less digits than its factorization.

61690516361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667311290.

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 61690516361 in words is "sixty-one billion, six hundred ninety million, five hundred sixteen thousand, three hundred sixty-one".