61565363761 has 16 divisors (see below), whose sum is σ = 68459618880. Its totient is φ = 54888275520.

The previous prime is 61565363753. The next prime is 61565363767. The reversal of 61565363761 is 16736356516.

It is a happy number.

61565363761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61565363761 - 2³ = 61565363753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61565363767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1370686 + ... + 1414888.

It is an arithmetic number, because the mean of its divisors is an integer number (4278726180).

Almost surely, 2^61565363761 is an apocalyptic number.

It is an amenable number.

61565363761 is a deficient number, since it is larger than the sum of its proper divisors (6894255119).

61565363761 is a wasteful number, since it uses less digits than its factorization.

61565363761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46656.

The product of its digits is 2041200, while the sum is 49.

The spelling of 61565363761 in words is "sixty-one billion, five hundred sixty-five million, three hundred sixty-three thousand, seven hundred sixty-one".