30561649761 has 4 divisors (see below), whose sum is σ = 40748866352. Its totient is φ = 20374433172.

The previous prime is 30561649733. The next prime is 30561649771. The reversal of 30561649761 is 16794616503.

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 not a de Polignac number, because 30561649761 - 2¹⁵ = 30561616993 is a prime.

It is a super-2 number, since 2×30561649761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30561649761.

It is not an unprimeable number, because it can be changed into a prime (30561649771) 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, 5093608291 + ... + 5093608296.

It is an arithmetic number, because the mean of its divisors is an integer number (10187216588).

Almost surely, 2^30561649761 is an apocalyptic number.

It is an amenable number.

30561649761 is a deficient number, since it is larger than the sum of its proper divisors (10187216591).

30561649761 is a wasteful number, since it uses less digits than its factorization.

30561649761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10187216590.

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 30561649761 in words is "thirty billion, five hundred sixty-one million, six hundred forty-nine thousand, seven hundred sixty-one".