61631046361 has 4 divisors (see below), whose sum is σ = 61672662324. Its totient is φ = 61589430400.

The previous prime is 61631046349. The next prime is 61631046371. The reversal of 61631046361 is 16364013616.

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 44544635136 + 17086411225 = 211056^2 + 130715^2 .

It is a cyclic number.

It is not a de Polignac number, because 61631046361 - 2⁵ = 61631046329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61631046361.

It is not an unprimeable number, because it can be changed into a prime (61631046331) 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, 20805760 + ... + 20808721.

It is an arithmetic number, because the mean of its divisors is an integer number (15418165581).

Almost surely, 2^61631046361 is an apocalyptic number.

It is an amenable number.

61631046361 is a deficient number, since it is larger than the sum of its proper divisors (41615963).

61631046361 is a wasteful number, since it uses less digits than its factorization.

61631046361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41615962.

The product of its (nonzero) digits is 46656, while the sum is 37.

Adding to 61631046361 its reverse (16364013616), we get a palindrome (77995059977).

The spelling of 61631046361 in words is "sixty-one billion, six hundred thirty-one million, forty-six thousand, three hundred sixty-one".