61001000061 has 4 divisors (see below), whose sum is σ = 81334666752. Its totient is φ = 40667333372.

The previous prime is 61001000041. The next prime is 61001000113. The reversal of 61001000061 is 16000010016.

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 61001000061 - 2²² = 60996805757 is a prime.

It is a super-2 number, since 2×61001000061² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61001000061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61001000041) 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, 10166833341 + ... + 10166833346.

It is an arithmetic number, because the mean of its divisors is an integer number (20333666688).

Almost surely, 2^61001000061 is an apocalyptic number.

It is an amenable number.

61001000061 is a deficient number, since it is larger than the sum of its proper divisors (20333666691).

61001000061 is a wasteful number, since it uses less digits than its factorization.

61001000061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20333666690.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 61001000061 its reverse (16000010016), we get a palindrome (77001010077).

The spelling of 61001000061 in words is "sixty-one billion, one million, sixty-one", and thus it is an aban number and an uban number.