61506522405 has 24 divisors (see below), whose sum is σ = 106988046048. Its totient is φ = 32687558496.

The previous prime is 61506522383. The next prime is 61506522431. The reversal of 61506522405 is 50422560516.

61506522405 is a `hidden beast` number, since 61 + 506 + 52 + 2 + 40 + 5 = 666.

It is not a de Polignac number, because 61506522405 - 2⁹ = 61506521893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61506522405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2402127 + ... + 2427596.

It is an arithmetic number, because the mean of its divisors is an integer number (4457835252).

Almost surely, 2^61506522405 is an apocalyptic number.

It is an amenable number.

61506522405 is a deficient number, since it is larger than the sum of its proper divisors (45481523643).

61506522405 is a wasteful number, since it uses less digits than its factorization.

61506522405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830017 (or 4830014 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 61506522405 in words is "sixty-one billion, five hundred six million, five hundred twenty-two thousand, four hundred five".