61648407811 has 4 divisors (see below), whose sum is σ = 64328773392. Its totient is φ = 58968042232.

The previous prime is 61648407791. The next prime is 61648407913. The reversal of 61648407811 is 11870484616.

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 61648407811 - 2²¹ = 61646310659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61648407511) 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, 1340182756 + ... + 1340182801.

It is an arithmetic number, because the mean of its divisors is an integer number (16082193348).

Almost surely, 2^61648407811 is an apocalyptic number.

61648407811 is a deficient number, since it is larger than the sum of its proper divisors (2680365581).

61648407811 is a wasteful number, since it uses less digits than its factorization.

61648407811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680365580.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 61648407811 in words is "sixty-one billion, six hundred forty-eight million, four hundred seven thousand, eight hundred eleven".