61651244211 has 4 divisors (see below), whose sum is σ = 82201658952. Its totient is φ = 41100829472.

The previous prime is 61651244197. The next prime is 61651244257. The reversal of 61651244211 is 11244215616.

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 61651244211 - 2⁶ = 61651244147 is a prime.

It is a super-2 number, since 2×61651244211² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61651244411) 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, 10275207366 + ... + 10275207371.

It is an arithmetic number, because the mean of its divisors is an integer number (20550414738).

Almost surely, 2^61651244211 is an apocalyptic number.

61651244211 is a deficient number, since it is larger than the sum of its proper divisors (20550414741).

61651244211 is a wasteful number, since it uses less digits than its factorization.

61651244211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20550414740.

The product of its digits is 11520, while the sum is 33.

Adding to 61651244211 its reverse (11244215616), we get a palindrome (72895459827).

The spelling of 61651244211 in words is "sixty-one billion, six hundred fifty-one million, two hundred forty-four thousand, two hundred eleven".