61000005511 has 4 divisors (see below), whose sum is σ = 61015865872. Its totient is φ = 60984145152.

The previous prime is 61000005491. The next prime is 61000005559. The reversal of 61000005511 is 11550000016.

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

It is a cyclic number.

It is not a de Polignac number, because 61000005511 - 2⁹ = 61000004999 is a prime.

It is a super-2 number, since 2×61000005511² (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 (61000005211) 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, 7924410 + ... + 7932103.

It is an arithmetic number, because the mean of its divisors is an integer number (15253966468).

Almost surely, 2^61000005511 is an apocalyptic number.

61000005511 is a deficient number, since it is larger than the sum of its proper divisors (15860361).

61000005511 is a wasteful number, since it uses less digits than its factorization.

61000005511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15860360.

The product of its (nonzero) digits is 150, while the sum is 19.

Adding to 61000005511 its reverse (11550000016), we get a palindrome (72550005527).

The spelling of 61000005511 in words is "sixty-one billion, five thousand, five hundred eleven".