30661278261 has 8 divisors (see below), whose sum is σ = 41051338944. Its totient is φ = 20356034880.

The previous prime is 30661278211. The next prime is 30661278299. The reversal of 30661278261 is 16287216603.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30661278261 - 2⁷ = 30661278133 is a prime.

It is a super-2 number, since 2×30661278261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30661278211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21203481 + ... + 21204926.

It is an arithmetic number, because the mean of its divisors is an integer number (5131417368).

Almost surely, 2^30661278261 is an apocalyptic number.

It is an amenable number.

30661278261 is a deficient number, since it is larger than the sum of its proper divisors (10390060683).

30661278261 is a wasteful number, since it uses less digits than its factorization.

30661278261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42408651.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 30661278261 in words is "thirty billion, six hundred sixty-one million, two hundred seventy-eight thousand, two hundred sixty-one".